this is just a guess, but that door looks like it is off of a newer (89+) bed, they have that wheel well right there next to it, so have more curve??
Look at the 2nd pic in this post:
http://www.yotatech.com/f116/what-yotatech-nicest-85-95-pickup-post-them-130349/index3.html

There are many in that thread to compare to... but for some reason, 90% are from the driver's side... why is that??

With 200+ Billion electrical parts, the world most complicated machine is inside your own skull.

Question Reality.
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'89 Rnr DLX "SR4.5", 32s w/ 5.29 locked f/r blah blah