I have poly body mounts and they work ok. However, don't use poly for rear suspension bushings. This thread has a lot of info about G body bracing. https://gbodyforum.com/threads/f41-and-aftermarket-bracing-diagrams-more-pics-added.8126/
not even sure if they were ever changed, I'm 2nd owner.I’m not sure the factory rubber mounts are even still available. When I checked, some guys were using select Camaro mounts due to lack of availability. Energy Suspension makes a nice polyurethane kit which I installed on my car. The Energy Suspension mounts are likely cheaper than sourcing all the factory rubber mounts. The ride isn’t too harsh and they don’t make any squeaking noises. If your body mounts have never been changed they need to be replaced anyway.
An alternative on the body mounts is the Summit kit which supposedly will last like polyurethane will but isn't quite as firm as poly. I have a set for my car which I haven't installed yet. I've seen some good reviews on them by members on here.....
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