Don't think they exist. You may want to contact TROS or HDD to see if they may manufacture one. Not much of a demand so expect to pay out the *** for one. I just decided to go to a AAC 51T mount and use my SDN6 can on the FS2K. Figured that the extra room in the can might help with the blowback problem that the FS2K seems to have with cans.
this is what i was thinking of doing cause cant find proper surefire mount but have lots of time to dwell on it