Dimension A: 3.29"
Dimension B: 2.42"
Dimension C: 0.68"
Dimension D: 1.81"
Don't forget the sides have a bend in them inward toward the cowl. The dimension across from B at the cowl is 2.22: This was measured at the front edge of the top of the cab.
Let me know if you need anything else, Rich.
Charlie