I would include a new style body for no charge if you like...:thumbsup:
I'm mostly interested in an EX10 piston, but that is kind of tempting... hmm, how easy is it to swap the light engine in a D10? The EX10 is dead easy, but I haven't tried it with my D10.
The D10 is not quite as easy, as it doesn't have a bezel. You need needle nose tweezers, first you have to take off the brass ring, then screw the light engine out, remove the plastic washer from the reflector and screw that one out as well. The lens and the o-ring should be no problem.
I don't know if an old-style head fits on a new style body. If it does, you have a good chance, that the ano isn't exactly the same, so I think it's best to swap the internals in the new head. The new body will probably have the advantage to give you a little more way for piston action when the head is tightened, sometimes a problem with the old bodies...
EDIT : If you perform a search, you should find a video on how to disassemble a D10 correctly!