Anyone knows where I can get the hard rubber (whatever it is made out of) guide that glides up and down when you raise and lower the top?

Good Morning. The remaining Hi-Lo parts are available on ebay. The guide block you are looking for can be found here:

https://www.ebay.com/itm/12588663045...Bk9SR6zD6cG-Yg

Hope this helps. Good Luck!

Thanks, I ordered one, If you know the right name of something you can find them. I did not think of guide "blocks" Thanks so much.