Originally Posted by truckernix
So, do they sell a replacement or is previous Chevs of the 40s catalog wrong?
To clear up the misunderstanding.
The Chevs of the 40s
links ONE Car, and TWO Truck, that tclederman posted are really bushings for the ends of the leaf springs.
On both the pages, the heading says "Differential Bushing -Bolt With Nut, Rear End To Spring" which is misleading.
When you read the page body it says "These are bushings with bolts, nut. shackle to leaf spring."
The heading should say "These are bushings with bolts, nut. shackle to leaf spring."
Chevs of the 40s screwed up.

The SPRING SEAT Master Parts Cat. part# 3652182 Group# 5.403
Greg_H posted this LINK Steele Rubber will repair the Spring Seat. no part sevice only.
Obsolete Chevy Parts Co might have a NOS SPRING SEAT

You might need the RUBBER WASHERS (spring seat Seal) Master Parts Cat. part# 597267 Group# 5.404
Chevs of the 40s has them HERE
Steele Rubber has them HERE

Spring Seat from 1954 Chevrolet 3100 Panel Truck
Pic ONE
Pic TWO

I can't find who carries the Spring Seat hanger eye bolt.
MPC Group# 5.404, part# 597268