I have had 6 3800 cars. 4 of them S/C. I have just used what I can get and have not had any problems to include the Anchor junk.
Basically that is what you get. One of my 3800s had rocker arms(increase lift without a cam swap), 2 sizes smaller pulley, full exhaust. It was an ok mover (low 13's) on questionable aftermarket mounts that were in better shape then the old stock ones.
You are limited, that car is 25 years old. I am pretty sure you are not laying into on daily basis. Don't think too hard about it, you are not
getting quality mounts for that thing in 2026, but you will get some that will give you a few years. I have Anchor in the 05 Lacrosse right now. Have been in there 2 years with issue.