For my 1999 LeSabre:

High-Mount brake light wasn't working ... so replaced the 1156 bulb ... still didn't work.

So: disconnected the bulb socket from the harness connector and looked inside the socket with magnifying glass.

Looked like the socket-tube side-contact tab (to touch-to the bulb-base side) may have been mostly broken-off
-so:
with small screw-driver pushed-outward that remaining piece of the side-contact tab
(got it to the point I could barely get the bulb back into the socket ...
... but was good because the side-tab was then gouging into bulb side).

Put it back together into the brake light assembly ... so far for past few days working OK.

So I went to find the GM part# for the socket
- found this (of course, discontinued regardless socket is used up to year 2005 GM models):

Buy GM 05972532 Socket, genuine OEM part

So:
anyone else have any experience with using a universal 1156 socket for the GM # 05972532 socket ?

Maybe this
(since the diameter size is in ballpark of exact 1-inch diameter hole in the high-mount light assembly, with 2 twist-in tabs) ?:
Dorman 85804 ?:

https://www.dormanproducts.com/p-125...origin=keyword

Thanks.

I did a google search using 05972532 GM, see what you find, I did see them on fleabay too.
I found one here in Canada you can order.. https://www.gmpartsdepot.ca/p/Cadill.../05972532.html
Hope this helps.

Thanks for the reply.

About the eBay thing and the Canada GM dealership listing ... I had already traveled thru that prior to my 1st-post on this ... here'* the detail I didn't include in the 1st-post (thought it would have been too much at that point):

The international Shipping (into USA) from the Canada dealership is ~ $35 CAD ... and then ~ $9 CAD for the socket = ~ $44 CAD ... which in US dollars (at ~ 75% exchange rate CAD to USD) = $ 33 USD (a little "pricey" in my opinion for an 1156 bulb socket, regardless should be an exact replacement).

Earlier this past week I also contacted via email the following to ask about either used or NOS or universal-equivalent-to or after-market for GM part # 05972532 socket:
Dorman,
repairconnector.com,
vpartsinc.com,
uneedapart.com

Only reply was from Dorman that stated "no cross-reference to that part#".

So ... that'* why I am currently (casually right now since the "surgery" I did on the broken GM OE socket appears to still be working) going into the idea of likely using a generic socket for an 1156 bulb in that high-mount brake-light assembly ... and was wondering if anyone on GMForum.com had done that for the 1990'* GM V-6 cars (LeSabre, Bonneville, 8.

And the thing that I am somewhat curious about is:
that GM # 05972532 socket was used on GM vehicles up to model-year 2005
- so: why is that socket absolutely not-available as NOS in the U.*.A. ?
(that is just something I look at and wonder why) ... don't know ... maybe it had something to do with the re-management of GM after the financial-crisis thing at-end of year 2008 (just a thought from my imagination).

Here the further story:

I also have a 94 Bonneville ... so ... today I got into the Bonne trunk and disconnected that 3rd-brake-light bulb-socket (same GM part # 05972532) from the OE wire-harness and from the light-house assembly.

After un-screwing the 1156 bulb from the Bonne 05972532 socket, I saw what is the flawed GM-design with that socket:
the metal ground-tab was ~ 50% eaten-thru ... the socket-bulb ground-tab corrodes right at the point that the metal ground-tab has a tension-bend to meet against the side of the bulb ... so ... when the metal ground-tab bend becomes totally eaten-thru then the bulb looses it'* ground connection (since the body of the socket is totally plastic).

So after seeing that, I am even more miffed at the fact that GM discontinued that socket GM part # 05972532 and that part currently isn't available anywhere new or NOS except for a Canadian dealer that sells the part for $9 CDN + international shipping to the U.*. for total $43 CDN (~ $34 US dollars).

I'm miffed because it'* obvious this socket appears to be an eventual needs-to-replaced part on all the GM vehicles that used this part from early 1990s up to ~ year 2005 (since it needs to be replaced on the 2 of the 2 vehicles I have (99 LeSabre and 94 Bonne) that'* a 100% replacement-rate) ...
... but as I have stated:
the part isn't available new nor NOS ... and ... from what I've seen today it doesn't make sense to buy that socket from a salvage yard since the socket metal ground tab will likely be just as corroded (or totally corroded to malfunction) from any used GM vehicle.

So: the alternative:
I did buy the Dorman part # 85804 universal 1156-bulb socket (that I had posted originally in this chat couple of weeks ago) ...
... that Dorman universal socket does appear to fit solid-enough in the hole of the 3rd-brake-light assembly,
since the 2 side hold-in tabs on that Dorman socket "squeeze together" to fit that socket into the assembly
(then let-go of the "squeeze together" on the 2 side hold-in tabs and the Dorman socket is solid-enough held on it'* own into the assembly)
- only thing I have left to do is cut the OE harness 2 wires then crimp in couple of spade connectors and hold the harness ground-wire
to the body of the universal socket with a small hose-clamp (or maybe solder the ground-wire to the universal socket body).

Regardless: to me it'* just "not right" that GM part # 05972532 currently isn't available new for not more than ~ $15 US dollars ... since to me it indicates that GM isn't supporting it'* fans for what appears to be a normally-required replacement part.