73 Cuda U joint

[MOP wAteR]

I was wondering if anyone could help me with a 1350 to 7260 U joint. For a 1973 Cuda 340 4 speed. Has a 8.75 with a Dana 1350 yoke. Got a conversion joint from Dr. Diff but the body is too big to fit into the drive shaft. Any help would be appreciated.

 

[Katfish]

Got a pic? 7260 is small, surprised that doesn't fit?
Contact the good doctor, he's usually come across odd situations.

*** Edit: This shows up in an Ebay ad:
THIS IS A HEAVY DUTY U JOINT, IN RARE CASES YOU MAY HAVE TO SLIGHTLY GRIND THE YOKE FOR 7260 SIDE TO INSTALL