John,
I recently installed the bumper overiders from Finish line on my BDR. The threads in the overiders are US vrs the metric threads on the quickjacks, so you'll need to replace the allthreads and nuts. I used the same S.S. sleeves that came with the quickjacks and held them in place with nuts & washers inside the car body. I did have a problem at the rear, with no access due to the proximity of the gas tank. I have them installed, but am not real happy with the appearance. I will fix it right when I pull the gas tank to change out the rear gear. Also, the overiders from Finish line are more upright than some I've seen, I'm still trying to decide if I want to do anything about that. The car definitely looks better now, and I don't bang my head on these near as often!
Paul