I am looking for the frame side bracket that supports the clutch Z bar on a '66 Chevy 1/2 ton, w/V8 and 4-speed trans. It is normally riveted to the frame, but mine has broken several times and been welded back together.   I now just bolt it to the frame. I cannot find one anywhere as a new/restoration part. Maybe somebody out there has an old/wrecked frame and they could cut the rivets and sell me just the bracket.  
Thanks much.  

I would try LMC Trucks or Brothers and see what they have.  

Since you have one already for measurements, it wouldn't be that hard to make a new one.