Just buy a motor and regulator on ebay. They come as a package deal for like 40 - 50 bucks. That way you replace them both and dont have to guess. Its pretty easy to take the assembly out. You need to take off the door panel (normal clips and a hidden bolt or 2 and unplug electrical connector) and then the motor and regulator are normally just held in place with bolts. You will be able to see which ones hold the them in place and will probably have to move the window up and down to get at the ones holding the window to the assembly.
I did a quick check on ebay and they only ones I could find were $88+ and they only fit 4-doors... Mine is a 2 door coupe. I will keep checking, but if you spot one, please send me the link.