Speaking of just 5 bolts, it would be sweet if you could put a 100 series drive flange on an 80- that would be a nice upgrade, to what in my experience was a bit of a weak point. the bolts with the cone washers are 10mm- takes a 14mm socket to remove, so they won't strip as easy. Those pins are bigger too- I bet you could mill out an 80 hub to retro fit... I still don't like just 5 lugs, but I do like the bigger drive flange bolts, and yes there are 6 of them.
Oh, and the star washer between the big nuts is the same. Same nuts too, for that matter.
82 fj40, 99 uzj100, 06 gx470
97 DR650, 05 525EXC, 01 XT225, 89 TW200, 09 TTR125, 07 TTR90, 07 CRF50