No I don't remember. I remember one had an MTR-79 part number, but I don't recall which one.
As far as the vents go, I would have to measure when I get home, but I would say the plastic part sticks up at least a quarter inch. I don't know if it matters, but you can see from the picture posted on the first page that the plastic doesn't go all the way around though. It has like five sections to it cut out on the sides. So my assumption is that when the valve opens, the grey part pops up allowing the gas to leak out the sides.
2003 Black SLE-Stock
2000 Mercury Mountaineer
1968 Oldsmobile Cutlass Convertible-455 cubic inches of muscle