Looking for a rear suspension bushing recommendation

[Jagdpanzer]

I've developed an annoying squeak in the driver side rear suspension that has to be fixed before the long trip to BG next month. Appears there are several aftermarket polyurethane bushing kits available. Looking for recommendations from those with experience on the best one to consider for decent ride quality and no squeaking.
Are the OEM rubber bushings still available from GM?

Thanks,

Phil