I remember Steve Wilkinson stating at the Monterey fun rally a few years ago that he had a new bushing design coming that would rotate. Given that Hall is just around the corner from Wilkinson, maybe these are the new bushings Steve mentioned?
For what it is worth I just recently purchased bushings and ball joints from Maseratinet through their ebay store. I made a reasonable offer and they accepted. The bushings look stock with the exception that the outer surface that presses into the control arm is ribbed. picture taken from their ebay listing.