Rich, thanks for the tip. I initially could not find them, but did a search for "bushings" on Doug's site and found them. They are $1.50 for a package of 8 brass bushings for KC trucks. For info, SHS made replacement metal wheelsets for AF cars that will work great with these bushings, especially on SHS or FasTrack. I have a couple of sets, they improve things even w/o the bushings. They made two styles of the flat end axles, one for power pickup and one standard insulated. Hopefully MTH will re-release these wheelsets.