What is wrong with the door? If it is rotten wood damage, that is somewhat easy to replace and would be much cheaper than a new door. I doubt you'll be able to find a replacement door exactly like the original.
Depending on the extent of the damage, you could probably rebuild it in a day or less if you just have to replace wood. If you have to replace plastic, then that does take more time to make it work with the existing door frame.
If the original is beyond repair though, I think you should measure the opening in the FW. New doors could have, and probably do have different size flanges, so a new door might not fit or might be very loose if just measured by the existing flange. Since most companies custom make these doors, they wouldn't return it either...
2007 T-286SR Cherry/Granola, #6236, original owner, current mileage: 9467.8 (as of 5/26/19)
1997 T-2653 Blue Denim, #5471
1979 12 1/2' MC, Beige & Avocado, #4639
Past Sunlines: '97 T-2653 #5089, '94 T-2251, '86 T-1550, '94 T-2363, '98 T-270SR