I also needed long 7/16" carriage bolts for my aux. fuel tank. Couldn't find them in Idaho or Utah so I ended up welding all-thread to some shorter bolts. Seems to be working fine so far.
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1972 C-10 LWB, 400/350, 2WD
1972 C-20 Custom Camper, 350/350, 4WD (Converted)
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