yours is the traditional understanding


Here are some new information (see Facelift Dash)

* Per the factory parts catalogs, 1971 PB110 uses same dash and dash pad as 1970-1971 B110

Now in looking at many photos
* Some 1972 dash look like single hump
* Some 1972 dash look like double hump
It may just depend on the angle the photo was taken. What we need is a 1972 PB110 parts catalog, then we'd know for sure

The top of the 1972 dash is flat, and the humps extend forward



Here is the B110 dashes (not PB110) from the factory parts catalogs