This Search Box is what you see on the home page for Lionel Support. I've entered your product number:
But this Search box has a fatal flaw. DO NOT hit 'Enter', or click on 'Go' either, after typing anything in that box. Instead wait a few seconds and the search results will appear magically (without you having to hit 'Enter' or click on 'Go').
Like this:
Now, click on the text "SKU cs-6-18009" and it'll take you directly to your Mohawk's top-level parts page where you can find several assemblies for you to drill down into.
Let us know if this helps.
Mike