1994 Cadillac SRX - STS rear knuckle bushings

GM has designed a bushing used at top and bottom of the rear wheel knuckle assy, supporting the control arms, these like all rubber parts wear out, But are apparently are not serviceable, one must buy a complete assy from GM, in order to replace a low cost part of that assy that will and does wear out. My question is, has any one out there, like MOOG, I love there Problem solver line of parts, has anyone found a solution to this timed release part failure. I have in the past, and may still redisigned many, many things on many makes, to make one of the best cars on the road, still be on the road.
"Timed Release Part Failure" a growing trend
Dave W sr a Frustrated Mechanic ( my own car)