Help Identifying LaserWriter part (laser/scanner?)

[bad328@aol.com]

I have an Apple Laser/Writer part that I purchased at a University surplus auction years ago. There was no paperwork or labels other than what's on the part itself. I believe it's a laser/scanner assembly for a Personal LaserWriter since it's on 300 DPI but I can't track down the specific printer. I would appreciate any help.