A couple of years ago I replaced my failed rear wiper motor with one I got online.  The short story is that 1) It didn't fit properly from day 1 (only 2 of the 3 mounting holes lined up) and 2) It has developed a fault during this winter's cold spell whereby it silently drains power from the battery.  It managed to total one battery (which was 4 years old, so I didn't immediately look elsewhere for a problem) and almost totalled a second in 2 weeks before I cottoned on and pulled its fuse.  I'm now awaiting a replacement motor from Horton.

ECP didn’t work for me either so needed to get a genuine part.