You need to track down the guy from Renton, Washington, or another guy in Indiana who supplies axle parts.
You have to go over the posts from the Ford Forums. Ford used Dana 30 and 35 centers from Eaton/ Spicer, so the supplier is aware of the Axle tag that yeilds the right part interchange.
WCY-AA
2L83/ 3L20 /3L50 / 4L00 has a L suffix in the ratio, and is common to the beam axle Econoline Falcon pickups as well as the Unibody Ford XK based passenger Pickups, Wagons, Sedans in the Fairlane/ Comete/ Falcon/ Ranchero coil over a arm line of vehicles.
WCY-AA, -AF, -AG, -N, or -R
7.25 in ring gear, non-removable carrier, 24 spline axles
-AA, -AG locking
-AF, -N, -R non-locking
Both Wally the Shark, Route--66-- and the Ford Forums guy Bruce ( BJBOZ) got there axle parts from one of those two suppliers.
BJBOZ got his Eaton Cone clutch which fits on the same Corporate Chrysler/ Ford 7.25 inch centre.
Read post #27
"
https://www.fordmuscleforums.com/threads/limited-slip-7-25-rear-end.500968/"
"Grave dig I know, and I fear that Bongos444 has moved on but I have just purchased from a gent in Indiana a Equa-lok LSD that came out of a 7.25" Ford diff. It had 2.83 gears.( which I also have) The gent has reco'd it and I will be installing it in a '66 Australian round body. Not going to be pushing a lot of HP.
It will be installed in a 5 lug Ford utility diff ( Ranchero equivalent in the US)
These Equa-loks are rare as hen's teeth so I am fortunate to have purchased it.
cheers
BRuce"