Wow, that's ridiculous. They must think you really need them...

We're not talking about much of a difference in axle tube diameter here.
I just used a pair of calipers and carefully measured axle tube diameters.
14 bolt 3-3/8"
Eaton 3-1/4"

The original GM saddles and the bolt hole spacing may just clear the 3-3/8" axle tube on the 14 bolt. I don't have or can't find a clean set to measure just yet.
U-bolts are 5/8" so spacing needs to be 4" minimum up to perhaps 4-1/4" center to center.

This means with just 1/8" difference in diameter or 1/16" per side a little machine work could adapt the original saddles (for 2" wide springs) to the 14 bolt.
Similarly you could scavenge 2" wide spring perches from an old Eaton housing.


•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-