My 70 C10 Project 2nd Exhaust issue

[Danman09]

I finally bought a new exhaust manifold for this inline 250 off Amazon. As some others have said, the casting is rough, however it is straight as an arrow and seems to mate up well. As I started pulling the hardware out of the box the previous owner had given me, I found that I had 2 long manifold clamps and 3 short ones. First the original manifold was cracked, as was the 2nd one he gave me, now I am missing one short clamp. Is it true that nobody makes these anymore ? If so what have you guys found to be the best substitute if I cannot locate a clamp ? This truck was 80-90% complete when the owner quit on it 12 years ago. New paint, engine rebuilt at a machine shop locally, then never had the bolt-on parts put back on it and cranked. I am anxious to see if it will run. Thanks for any advise on buying a clamp or making one.