I think that one is meant for mounting your own LED and/or driver (says it is optimized for XRE). The reason he mentioned P60 is because it is kind of a common size and form factor for all in one drop ins . Sometimes those DIY bodies are actually factory seconds.

In the ultrafire line, WF-501A,B,C,D, WF-502B,C,D, WF-503B,C and 504B will all take P60 drop ins (26mm diameter which is much smaller than the one you have). There may be others. Some of them are cheap the 502Bs with Luxeon emitter is only $10.