Is this where one stop is? I marked a red mark at the suspected location.
If so where is the other stop?

Yes that is the stop. Single cable attachment, & one caliper leaver/stop per side.

Ok, I'll look at it tomorrow if possible, it rained today so I was not able to.

I wonder how that works, when adjusted I am guessing you want the parking brake to be applying just enough force once it is all the way against the stop.
If so then when I release the parking brake it should be backing off of the stop a bit?
If so mine may definitely be stuck/frozen, because I don't recall seeing the spring change position.

Found out my calipers springs had froze up on both sides, had to get new calipers, so since I work too much to do my own work right now I had to go to a shop..

I had new pads and rotors put on the front and back of my 2006 Grand Prix GT, and had to have my calipers replaced as the parking brake springs on the calipers froze up. I spent like 217.00 in parts for two new calipers, and 150.00 for him to put them on. A brake fluid flush was 52.00 and 11.00 for the synthetic fluid... I provided the powerstop cross drilled/slotted rotors and pads.. And I got it inspected.. The parking brake light and low brake fluid light stayed on and he could not figure it out, he replaced the sensor for free, and gave up as he did not know what the issue was.. I got it back and drove a little, parked in a parking lot, popped the hood and poked at the float in the master cylinder, and bam no more lights or warnings, lol 620.00 later.... I could have saved almost 400.00 if I had the time to do it myself..
Car stops great now though, no more shaking from warped rotors..
The Powerstop cross drilled and slotted rotors look good on there also!

A few $$ invested but well worth having it all done, and safe again now!
It is nice to have GO, but even better to have WOAH !
I will be looking at my brakes soon, with a tire rotation. I need calipers too.
Got to drain the 2.5 year old coolant and get some fresh stuff in there, before winter hits.

Yeah it feels good to have it inspected and passed, just sucks I had to spend so much right after the deer incident.
I spent 727.00 on parts for what the deer did, and I still need to get my aftermarket bumper, and my OE hood on the car, with a hand I can do the hood, but the bumper was a pain in the ***.
Then I'll need a 400.00 paint job to paint both parts...

The car deff goes, and today I had a woah moment, traction control was off, I seen a car coming and wanted to get out in front of it, so I punched it and I got a few nice screeches, lol
Gotta be careful not to wear out my Pirelli'*, lol