OP, that Ebay kit looks very similar to what I found in the door of my Hyundai, except this one doesn't use cables which is a good thing.
It gets rid of the hand crank machinery completely and as most of that is pretty worn out by this time, good riddance. For that reason, the setups that turn the window crank aren't very attractive to me.
The only problem I could see was mentioned above, straight vs. curved. I hope the designers of the kit figured that out. I bet they did.

R.