Are ican p-60s dimensionally different than their LED counterparts?

I'd like to find a single mode, LED drop in for a Surefire G2N. None of the drop ins I have seem to fit. At first I thought it was b/c of the so called tactical tail cap that has a momentary on switch for activation or must be screwed down to work. Upon further inspection, I've come to believe that the outside dimensions of LED drop ins (wider near the bottom) are different enough from the incan drop in (which has a more abrupt taper to the reflector) are preventing a workable exchange/upgrade.

In any event, even with the tail cap off the G2, you can't screw the head down w/ a LED drop in in there; at least not any of the few I've tried.

So, is there a difference between the two, size wise? If so, why? And is there a LED drop in that will work with the G2N?

Thanks in advance for any answers that might be forthcoming.

Are there two springs with your drop-in? If so take the outer one off.

At least now you guys know why my modifying of flashlights is limited to changing batteries. That worked great, as I'm sure you knew it would. It has, however, led to another question. The drop in I just tried is the proper voltage (3-6v), but there is an audible hum coming from the tail cap. I, of course, turned it right off, but any idea as to why?

See if the tailcap components are loose, by twisting clockwise.

not like this .

Is it buzzing in the head ?..On high ? worse on medium ??

So here is the deal, I tied a different drop in, single mode instead of 3M, and there was no noise. Both were Solarforce XM-Ls, which are likely way too much for the plastic light in terms of heat anyway. I think I'm going to look for a single mode drop in around 200L since my only goal is to upgrade to an LED for bulb durability and a bit more run time.

Chicago X, just for my own enlightenment and continued growth as a flashaholic, loose components would case a hum because of intermittent contact? Perhaps I should have stated this earlier, but the hum was similar to what you hear when you turn on those long fluorescent bulbs in a cold garage.

And Boaz, just how did you get my 2nd grade school photo?