Does anyone make window slide blocks?

@Map63Vette , I dont know why you are even trying to adjust your glass with totally worn out channel guides, do as @Dana67Dart suggested and go buy/install new guides and shoes, then read up on how to adjust the glass/vent frame. It can be a little challenging but not that difficult to replace them, and it sounds like you have mechanical aptitude so you shouldnt have an issue, but of course you have to pull your whole vent frame and window assembly. While you are at it, make sure to clean and relube all the moving parts. You may also need to use some spray lube on the inside of the glass channel if rolling the window is too difficult.
As many on here can attest, it can be a real pain to get the whole thing adjusted right, even worse if you have worn out parts.
Word of advice, the new guides will have to be trimmed to length/shape so make sure to compare your old one to the new and mark where you need to cut. Also, when making the holes in the guides for the guide pins, I used a point type soldering iron to melt the plastic rather than trying to cut holes; and make sure the guide shoes are totally clamped together.
Do some searching on this site and you will find threads dealing with this subject already and help if you need it.

Mine aren't actually super terrible, at least on the driver's side. They are still pretty much rectangular, the biggest issue is more just that the little round portion that sticks up where the pin goes in has broken some. My passenger window is pretty bad if you lift up and down on the rear of it for sure though. I was mostly just trying to get some semblance of sealing to keep the noise down. My weatherstripping was totally shot, so I only went after the windows after I put new stuff in and found it still didn't line up that well. Still likely planning to replace the guides at some point, but probably need to do the door hinges on the driver's side as well, so it's turned into a bit of a snowball project. I had the whole assembly out a couple of weeks ago to clear and scrub down all the channels because it was difficult to roll up and down. I think my bigger issue with that at the moment is actually the front to back glass alignment the more I look at it. I have them adjusted too tight so the front window drags on the rear window felt and actually rolls the window down while the trim stays in place. So looks like I need to get some new stuff to fix the trim to the window more firmly as well. The snowball just keeps growing, lol.