Sam-
unless you're lucky enough to find one of these doors for sale, you can
probably match up the formica at a store such as Home Depot and fabricate
your own door from a piece of plywood of the appropriate size.  Hinges and
latches that you can buy may not match exactly, but you should be able to
come close.  Matching the trim around the edge may be the hardest part.  

The sink pump can be bought from many vendors, such as the Bus Depot.

Bill