You can have them
Revulcanized at Steel rubber. Do your spring seats look like that?
Or pound
THESE into the cast spring seat housing. Same part number 3652182A as for 48-54 truck.
You should check to see if they will fit your 1946 1/2 ton pickup spring seat housings.
Group #
5.403 shows part# left 600175 & right 600176 for 1946 1/2 ton.
The 48-54 1/2 ton spring seats are the same on both sides. For some reason the 34-46 1/2 ton spring seats may be different, A picture would help.
An 8th of an inch is not much, but slop is slop.