Help - where to buy 1965 C10 tracking arm bushings??

[markbritt]

I have a 1965 C10 that I am doing a frame off restoration. I purchased a set of tracking arm bushings from LMC truck - they are too small. I picked up a second set off of ebay - same thing, too small. My tracking arm has an opening of approximately 1 3/8" and the bushings are a bit smaller than 1 1/4". Are there two different size tracking arms? If so, where can I get the larger bushing? Perhaps there is a later model Chevy that has a larger bushing? Any help would be appreciated.

Thanks
Mark