No and the 19 colorado isn't either thank god.

Don't know?

The original battery was a Delco 47PS lead acid. Find an AGM as they are fully sealed and do not cause terminal corrosion.
The BCi group replacement number you will need is # 47.
Follow this video for removal & installation.

Great now i need 10&13mm sockets plus a screw driver and a torque wrench in inch pounds just to change a battery. I have one for cylinder heads etc. but not inch pounds. I'll just tighten them by hand.
I love my chevelle...
10MM > 3/8"
13MM ≈ 1/2"
14MM ≈ 9/16"
19MM ≈ 3/4"

You may be tempted to stay from a 47 group size. Dont.

This is my old 01 aurora with my northstar in it but its a 34/78 mix. I bought it for a different car but used it for a short period in this one and you can see the fume harness, although they dont have vent issues, do vent still, so you want to have it hooked up. also the hold down im 90% sure was 14 mm but you should get 13 and 14 incase... extension too. also the foot pounds on a hold down arent a LOT lot but they arent inch pounds.. you should be able with your wrench

btw that car i showed the pic of is the closest thing to a lesabre that exists.

my bad that was a group size of your colorado not a lesabre of the OP.

I see, you shouldnt need an agm for a 2013 without start stop but if your battery was under hood, which i doubt at 47.. thats a big battery physically, yes, recessed slightly? or am I thinking of 92 or something. Anyway, you should stick with AGM if you had it but i can say rn you will be fine if you dontt... but you are still prob not coming out ahead esp if there are many loads on the vehicle.

Oh I saw the question about PA and the how did the conversion, this was my original setup which i DMed the guy who asked but sharing here. Isnt how i would do it today but worked long, currently the cable setup is a little yikes but so is other things lol