Hey,
Call DYE they may still have spares kits.
The solenoid I think was the same from the DM6 through to DM10.
The DM7 uses old style detents with springs:
DM8 used some funky magnetic detents but the DM9 eyepipe with inc detents fitted the DM8 so that was a common upgrade and I believe that eyepipe has not changed since.
Try and get hold of the DM7 eye pipes mainly as they smash at least once a year. I got a few last year, I think they are £10 each.
I am sure if you nose through the manual or PBNation there will be a complete o-ring breakdown and you can source them via ebay and the likes.
Enjoy the 7, one of only two markers I have that I have no intention of selling !
Ed