daveap - About a year ago I took ALL the door panels off my SCrew to instal JimmiJammer anti-break in plates. I seem to recall a slight problem getting the front panels back on, but I don't really remember specifics.
As I remember though, the panel is lifted UP to get it off the door. It seems to me I inserted the top of the panel back into the window slot first, holding the panel itself away from the door and making sure the door lock button was up through the hole. Yes, it was awkward! Then, I think I let the panel swing back against the door and I pushed it in hard there before pushing it down. As I recall, there were downward facing hooks that had to go through holes in the door frame that capture the panel when it is pushed down.
Maybe you could verify this by looking at the backside of the panel and the door frame? Sorry I can't be more help, as I said, it was quite a while ago that I did this and my memory of it is hazy.
And, grampoppop, I'm sorry I didn't notice your post before. I DO remember at least one other post about replacing the window regulator and I probably could have located one of them by searching the forums for you.
I don't spend as much time in the Electrical forum as I do on some others. Please don't feel we ignored you because you're new, I don't think we do that.