Yes, Malkoff specifically states on the website that the 6Z is one of the flashlights the M60 was designed for.
Yoda is correct about the lexan. LED's do not generate enough heat to cause any problems with it.
However, the head on the 6Z and older 6P's have slightly different dimensions than the current Z2 and 6P lights. So I can't say definitively that the website is correct, though I have no reason to believe it is not.