Wood
The GP9 and 30 are the same width as purchased from Shapeways. The GP40 mount is wider. For pilots without the predrilled holes. You will actually have to test fit first. Which is an easy process for non lionel engines. So far, the only nonlionel pilots are the Weavers U25B and RS11. In both cases I have gone with the GP30 mounts. Later today or tomorrow I will cover the pilots that I have to drill holes for the mounts. Please bare with me as I am still learning how to do How to stuff, unlike Mario and Doug( Laidoffsick ) who have made it an art form. The one thing I did do and this is what led me to try them on the nonlionel pilot was this. When I ordered the mounts from Shapeways for my Lionel GP30s and GP9s. I had ordered extra mounts of each. When I discovered with modification I could make it work for the MTH GP35s and the SD45s. I started to order more. At that time I also ordered the GP40 mounts, so I could see what they work in. I would recommend that you order a couple of pairs of each. Then when you are able to determine which works best with the Postwar and MPC pilots. Then you can order more. The less modification to the mounts the better. Its a lot easier to add styrene to the sides and bottom then it is to have to sand down sides to fit. That is in keeping of Mario's intent of being a simple bolt on conversion. Unfortunately this is unavoidable so far with the MTH pilots. Since you are doing this conversion with Postwar/MPC/027 equipment. You are defiantly breaking new ground and I am looking forward to seeing how you do it. Normally this thread would be in the 3RS forum, but I chose to put it in the Hi-Rail, O27 and Traditional 3-Rail O Gauge for more visibility to the Non 3RS crowd..
