You're lucky - my E2L body is no dice with an AW 17670 - the end taper gets me. My E1L fits an AW RCR123 no problem oddly. I use my KX2 head on the E1L body and from another thread in that configuration you can get around 40 minutes or so on high. So a 17670 will work (mine is a two mode) as well but give more runtime, how much more I don't know (but wish I could find out - may need to do some sanding...)...