need help identifying part

I've got a window lift motor for a '93 chevy lumina. I bought it about 3 years ago but never installed it, now I can't remember which window I bought it for. There are a few numbers on the unit.
The box says "GM- 326"
The part itself has the numbers "16627963" and "25.03.03" I think that one is the manuf. date.
Also the invoice for the item states: "item is known as 81-0078Y" for my application.

surely one of those #'s will be able to identify the unit. Also, if anyone knows, is this unit compatible with other years/makes/models? thanks!

It is for the r/s I can tell you that.

Well I checked with JC Whitney and, you were right, it is for the front - passenger side. Thanks Max!!