willysmjeeps.com

I believe MWM and AJP collaborated on the formation of the kit by a third party they sell. They use different part numbers in their listing but I have the kits and the only numbers on the kit are M38 & M38A1.
The AJP Listing says: WO-116882 Kit, carb, master. Best k… $55.00 Reproduction (Import)
MWM's listing says: Carb. Repair Kit $55.00
In each case above the same kit is used for both carbs.

Ron F's services each carb separately.

Rigid Steel listing is
$39.95 648065 . M38 Carb Repair kit.
$35.99 807885 . Carb repair kit for M38A1.

So I don't see the same numbers used by all of them and I see no evidence of who their kit manufacturer's are.

This leaves you with making your own choice or buying one of each and comparing the contents.

Rigid Steel products are usually Omix brand which not as complete or of the same quality as the carb kits sold by the military vendors.

Tom