Nick-
PTL Engineering was named in a prior thread as manufacturer of door stuff. I haven't verified that, but you can check them out.
Ron- If this is true, you can add the link to the library, and maybe the factory will tell you which years PTL supplied doors. Our 08 has a different door (a detent rather than a posi-lock type holder in the open position on the newer coaches), and I assume its a different manufacturer (so maybe another link applies?).