Bumpers, How High Should They Be?

[Bob Bidonde]

These are some actual measurements of restored Model A's taken from the center of the large bumper clamps:
1929 Sport Coupe 18.5" Front & 19.5" Rear;
1929 Cabriolet 18.5" Front & 19.5" Rear;
1930 Sport Coupe 18.69" Front & 16.5" Rear;
1930 Cabriolet 18.69" Front & 16.5" Rear;
1931 Coupe 17” Front;
1931 Victoria 19.5” Front.

I realize that there will be a lot of scatter in actual measurements from Model A's because of tires & suspension differences.

Is there any factory literature that defines the bumper heights when the Model A was showroom new?