alco's forever!!!!! Majoring in HO scale Minorig in O scale:)
RS2Mike:
Have you tried North West Short Line products? They make replacement parts for many drive systems. Here is their page devoted to MDC Roundhouse products. I have no idea if any of these offerings will suit your purpose. If you are not sure, send them a note and they can tell you if their parts will work.
http://shop.osorail.com/category.sc?categoryId=62
You might also find what you need here:
http://shop.osorail.com/category.sc?categoryId=42
Dave
I'm just a dude with a bad back having a lot of fun with model trains, and finally building a layout!