I think you have Spicer 1350 series U-joints, and if so the the Spicer U-bolt kit is 3-94-18X
http://cgi.ebay.com/ebaymotors/U-BO...itemZ370165002641QQrdZ1QQsspagenameZWDVW

As found in this Spicer catalog page 16:
http://www.roadranger.com/ecm/idcpl...tion=Primary&&dDocName=RR_J300P4

That's a common part that fits hundreds if not thousands of different model vehicles, and it's recommended you replace them after each use, they should be readily available in good parts store.

According to Spicer:
DO NOT reuse bolts, straps, nuts, or damaged bearing retainers,
or use inferior grade bolts. Reuse of bolts, straps, nuts,
or damaged bearing retainers, or use of inferior grade bolts,
can cause driveline failure, which can result in separation of
the driveline from the vehicle. A separated driveline can result
in property damage, serious personal injury, or death.
If loosening or removing bolts, always install a new strap and
bolts and torque bolts to specification.

Might try another parts place, they are very common and meant to be replaced

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
---All pictures---
"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-