'71 and '72 bay differences?

[Tofufi]

I've got a '71, but was wondering what the differences were from the '72?

Theres the small rear lights, and the vents. The tinwear / engine bay area. Was the '72 the first year of the smaller rear decklid/engine lid?

Anything else too? I seem to remember something about the bumper being different for the '72?

I'm sure this may have been covered before, but I searched and couldn't find it.

Ta

 

[Clem]

The 72 model years was the crossover year ... rear vents, rear engine lid, rear lights, one year only bumper and one year only front arches/steps. Plus the fixed rear valence and rear tinware.
First year of the Type 4 engine too, so some engine inspection hatches got fitted, ples some differences in rear suspension geometry for Type 4 engined buses.

Im sure there are more details, too?