[El Sol Infinito]

I would strongly advise against buying used equipment like that on ebay unless the deal is amazingly good. Just because the motor spins when it is hooked up to power does not mean it has enough moxie to push up your window. I've found that a lot of stuff for sale on ebay for tbirds is borderline junk or otherwise over-optimistically described.
You'll understand why I advise you to go with professionally rebuilt motors and such when you try to put the whole thing back together inside the door. You REALLY don't want to do it twice. I did. It's no fun.
And another thing: make sure you have the counterweight spring (the spiral one) tensioned really good on the regulator when you put it all back together, it doesn quite a bit of the lifting work.