Heads from the P,Z,C series will fit on this adaptor. The M2 head is the only one from the M series that'll fit too. Here are some similar setups of mine. I run these setups using AWs RCR123s.
Just be careful when fitting these adapters to the head, the O-ring is quite thick and with a little torque applied the adapter might be hard to remove later on. Try getting a smaller O-ring for easier disassembly.
Another thing... Has anybody experienced problems in getting the outer spring on various LED-modules to connect to the e-series body. I have had that issue and had to solve it by making a flatspring and soldering it to the rim of the pcb thus making a connection against the rim of the body.