[quote=LonnieC]Bennie -

They also have Grade 5 3/8-16 carriage bolts for the two outer bolts. 3/8-24 carriage bolts are not available.

It seems the carriage bolts are made of unobtanium...
but here are some Grade 8 3/8 X 24 x 2 1/2 hex heads. They also have the 7/16ths as well
3/8-24 x 2 1/2 hex heads


Give me ambiguity
or give me something else