u-bolt for rear springs?

["DANIEL TIMOT HEINZE" <dth104@psu.edu>]

Back around 1992/3, I needed to replace a broken u-bolt on the rear springs of
my 68 2000.  Someone on the list recommended a replacement this I think came
from a Chevy.  It's a heavier bolt and required redrilling the holes, but
otherwise it had the right dimensions.  I've lost the part number.  Does anyone
know what the spec for this is?

Thanks/Dan