I'm 6'4 and have pretty long legs, I always feel like I'm tucking my foot and lower leg under me in order to use the heel shifter. The extended ones would only add to that issue so I'm looking for a extended toe shifter only at this point.
Unimoose go to www.waltersworkshop.com he sales a 2 inch extended shifter that works as a toe or heel shifter. It looks OEM, and I used them on my 07 FLHS so my big feet could fit between the shifters.