The PARA dovetail is proprietary. There are several threads on the Para Owners of America Forum. This one had some suggestions if you didn't want to send it to Para for their night sights. http://para-usa.com/new/poa/forum/showthread.php?t=134
I'll have to dig through those pages a bit, there's a lot of information there but it sounds like it should be fairly painless (once the painful research is done).