I got some information on the Sequoia owners FB page, and I found a used, really clean regulator assembly on Feebay for $175. I decided take a gamble and messaged the seller to see if he had the guide wheel - I lucked out, because he said he had it and would just throw it in! From what I was told by a dealer I called, I'd have had to buy the whole guide rail assembly to get one because they come together (I already replaced the rails months ago). If you DO need everything, I found there are a couple of sellers that have entire kits - regulator, motor, guide rails, guides, and MPX box for $400something bucks, or you can do some homework and piece it together with a mix of used and new stuff, or all used stuff, like I wound up doing (except the glass). I love having the opening window, so it's worth it to me.