Rod I've gone through that parts kit myself. The issue is that most of the MTH tender trucks, especially on older PS1 locos are all different, and just weren't designed to mount a roller. Adding one, making it work, and look like a factory installation takes some creative engineering. I know there are techs on this forum that have done it, and might be able to offer input on specific locos. But it's not trivial. My $.02.
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