You've got several options, some from SureFire, some third party...
One option is the KX2C from SureFire. It's rated at 120 lumens, if I recall correctly, but it performs in the same league as the rest of the Cree Q5 lights out there. The beam, of course, is the same as you get from the rest of SF's E-series LED heads. A potential disadvantage (or advantage, depending on your preferences) is that the KX2C has only a single level of output, no low mode.
Another SureFire option would be tracking down an E2DL head somewhere (I believe they surface occasionally on the CPFMP). This would give you a low mode and crenelations, but it may be a bit harder to track down than the KX2C.
For a non-SureFire option, you could get a Malkoff VME head and M60. Like the KX2C, this would give you a single level of output, though you would have much wider and brighter spill, and you'd be able to put other M60 drop-ins in your light if you wanted.
I believe OpticsHQ has also made their own E-series head, using a Cree Q5, so that could be another option. And I think it has multiple levels of output, but I can't quite remember... Best not trust my memory on that. Not sure if it's still being produced, etc., but it could be worth looking into.
And, of course, if none of the above suit you, you could always send your E2L to any of the various modders that frequent these forums (Milkyspit's name is the first the comes to mind, but he's not the only one). If your E2L is one of the newer ones (2007 or later) then it already has a good Cree emitter (likely Q5), and so you would only need a new driver. If it's older, then of course a new emitter and possibly reflector/optic would be needed as well.