I recently purchased a Flaming River rack for my '79 Mustang coupe with an AJE K member for installing a SBC into the Mustang. I did not realize the bushings were missing that were supposed to go on the studs of the K member for mounting the rack.. My question is, what bushings am I supposed to use, the standard or power rack bushings, one or two piece? Any help will be greatly appreciated. Thank you, Gary.