MTH makes a 2- bay fishbelly hopper model that is close to scale, except for wheels and couplers. I convert all of mine to 2-rail and -- if not already done so at the factory -- I reletter them for the Western Maryland Rwy, which had thousands of them. MTH makes the conversion much easier by providing a shim for mounting the K-D coupler at the correct height. See the attached pictures.
I recently bought a set of six of these hoppers on ebay, but was disappointed to find that the shims were missing. Each car needs two shims, which MTH packages in a tiny clear plastic bag and puts underneath the car in the Styrofoam box liner. So, I need six of these little bags, twelve shims total. I would be happy to pay $5.00, shipping included. They should fit easily in a plain envelope. If you have more than six pairs, I wouldn't mind having a few extras.
I don't know how one transacts business on the Forum, so let me know how this works. Thank you.
Doug
By the way, here's a typical finished product:
