More on my HP7245A problem

[Jimmy D]

I have an HP plotter that's been seriously picked over. I bought it after it
 was parted out, just to get the pinch rollers. I've looked it over and can't
 find a model number anywhere, as a lot of the outer casing is gone. There
 is a little handwritten sticker in the bottom that says a few numbers, initials
 and 7580. That sounds familiar, but it's been months since I bought it, and
 can't remember. The servo(?) motors are still there, and a few small boards
 near them, but the bigger ones are all gone.
If you could point me where to look, it might have the parts.