Polyurethane or Polygraphite?

My kit from PST sent L clips that mounted to the lower shack bolt on my 71 dart, unsure how it would be for your car but would assume close to the same. Ya, poly makes for a VERY firm ride, but also very precise if your into hard core road racing kinda stuff, (mountain roads, slalom races, skid pad, drifting, etc) if your running anything other than a stock seat (ie RCI plastic seat or simialar racing seat) your butt WILL hurt after any long periods of driving (more than a half hour) also even the graphite ones squeek a little if you don't lube them up well. I have read that the uppers should be poly but that the main lower control arm bushing should be kept stock (something about permanent deformation of the bushing in extreme cases) I know that my pst kit sent the rubber lowers also, don't know if they still do that or not, just ask when you order. Also if you have or are getting a sway bar you'll want poly for that. All in all, I love the performance of the polys but for a regular everyday driver, not the way to go. PST also sends a video with its kits to help guide you thru the process if your going to DIY.