Just  curious if anyone has done the conversion on the 04-05 gs500f.  I have seen the r6/r1 conversion on the 500e, is it possible on the 500f or is the mounting completely different? 

the back end is slightly longer than the early gs's so you would probly have to gut some of the back off it to fit.
you could always go the whole hog, and chop the whole gs subframe off and mount a complete one from whatever bike you want the tail from

are there any tails that would make for an easier fit?

i think some brazilian company made one