Not sure if splitty bumper irons will fit the eb chassis rails but I think split rear bumpers fit, although the profile at the bumper ends is different.
I've always used FBI for good 2nd hand stuff.
Don't forget if the bus is '68 and it needs a lot of chassis work particularly at the front end that most stuff is '68 only.
ie, the chassis rails at the front are narrower in profile.
Hope this helps.