You get 4 H measurements regardless of antler make up.

Inside Spread 11 1/8

MB L/R
10 4/8, 10 1/8

G1L, G1R

5 3/8, 5 2/8

H1L/R

3 7/8, 3 6/8

Now, measure half way from the base to the Y and take a H measurement.

Then use that H measurement for the H3 and H4 as well.