Blind,

Here is a link to a 5/8 x 2-1/16 x 10-7/8" Grade 8 U-Bolt.

Not sure how long you need, but these are available in 1 inch increments down to about 5-7/8"

http://www.nickstruckparts.com/8u-3210s.html

Price is for 2 ubolts, 4 nuts, 4 washers.

Probably where I'll get mine.

Larry W.

1953 3800 Dually Flatbed