I didn't have part numbers and was in a shop that wanted me to buy a Greenberg book and look them up myself. I wasn't opposed to looking them up, but wasn't about to buy the book to do it when a shop book was sitting two feet away. His kid caught me on the way out and I delt with him from then on in.
The "transition car" with different couplers is an old trick, though it can be a toss up on "level" or a smooth transition of rooflines, and the body to truck ride height difference too. Look for something looking similar in truck type and height.
I have a Marx "Tilt V" El Captain car with a Lionel truck on one end so I can pull them with cast Lionel. At one point I had a rather unsightly dual coupler truck. A "spinner" set up.
I have a "spinner" tender with both drawbar reciever and a coupler, and I can spin it for engine drawbars with the coupler tucked under, and facing the rear. Or with it spun so the coupler is fwd. it is for use as an auxiliary tender or movent by a diesel or dockside loco.
Open latching and Scout Couplers is how we refered to the early ones. The Scouts having the cast housing / buffer looking similar to some protypical pin & link coupler's housings, but like the "lobster claw", very large versions of them.
