I am looking to obtain about 100 pairs of USA (only) knuckle couplers.
Are you talking about the plastic ones, metal ones or shelf coupler on the tank car. The engines are different also?
The standard Knuckle coupler that is included in the box when you purchace USA cars.
I don’t think the gunderson stack cars come with knockle couplers???
There are 3 kinds of couplers that come standard on USAT, all are different,shanks on knuckles.