I quess I should of created some context to the topic. I havn't been able to find the rear left regulator w/ motor online. Really I just need tbe motor as the regulator is still operating. Its a 2004 so I have replaced the front left, front right and rear right. Those went bad years ago. I havnt been able to locate a rear left motor online so I started thinking that maybe Its the regulators that are designed diffetently because of there unique position but that motor could alternate based on there position on the regulator , left or rightAs far as I know when I did the window motor on my 2001 tundra the right side driver window had a different part number than the passenger side....so I would d say