You can rather use a modern one, here is a link to a Toshiba SD-R6472 DVD and burner connected to a pismo, the original faceplate was even reused.
http://www.sterpin.net/uk/dvd8pismouk.htm
No huge modifications needed (small welding done to force it to master -pins 45 and 47) good use of patchburn to get it supported and some glue for the finish pismo look. :approve: