If you continue to look for bushings, try ...
McMaster-Carr, Enro, and racing suppliers like Behling Racing Equipment, Lefthander Chassis, CV Products, Pegasus Racing Supplies, as well as racing go-kart and race car chassis builders.
One you wouldn't think of are the airplane home builder suppliers like Aircraft Spruce (don't let the name discourage you ... they have LOTS MORE than just wood). The right bushings are out there, you'll find them.
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Started looking for 379 Peterbilt TC, 24' to 30' box, bumper pull--but ended up w/1999 Liberty Coach conversion of 45' Prevost XLV bus. 1,000sf heated/AC'd race shop w/dump station, 50amp shore pwr where bus parks, 3 NASCAR/ARCA race cars & 26' Bravo trailer.
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