Have 09 g8 GXP with 99k miles, replacing stock suspension with pedders coilovers. I know front strut mounts are shot but can’t tell if rear shock upper mount bushings are good haven’t pulled out shock, I’m sure the rear shock is bad because going over bumps is just so bouncy. If it is bad I’m trying to find a replacement bushing. Iv looked all over can only find the plate but without bushings? Now is there a alternative I can use perhaps camaro bushings?