068 115 105AN is a pump that fits a 1.6TD with 36mm
gears.
I have a listing that says the AN pump is for TD Jetta up to '87 and
028 115 105 G is for '88 on. That's a year off from where I'd expect
the 30mm to 36mm split is but I'd suspect that's still what's going
on here. Makes it look like the AN is a 30mm pump.
Loren