Hey Bussdaddy...would you have any filler necks for a late model bus tank
I'm sorry I'm fresh out of 68-71 filler necks right now, but if you want to install it in a splitty you really need a rotted out split tank to saw the filler neck off of, bay fillers mount differently and use a different cap, they work but the split filler is a better fit. 72-79 won't work at all for your needs as they are welded into the bus and in a completely different spot from the early models.
Alp and Steveo were parting early bays a while ago, maybe they have some leftovers?