My '68 tank is the same as Andy's, that one you have might be for a crossover only.
These pages are from the '68 parts book, printed in '71. So this tank came from a bus with VIN 212 2000 001 or higher. But would it fit a late bay as well?
Looks like it could fit late bays as well ... but not sure if all of the differences between early & late bay tanks were in the '72 tank :?