Help needed on a U joint

Wondering if anyone knows the part number for an internal clip U joint that is 3 5/8 square outside to outside for a driveline to differential yolk.
The driveline uses an internal clip the yolk has little capture tabs.


Edit: clip to clip is 2.5" (inside caps)
I need that on both sides

1967 Plymouth barracuda
8 3/4 489 case
3:23
Cone style sure grip.

Dunno why i can't get it figured.

TIA!!