Hi Brian,
It was my thought also that the inquirer was wanting information for modeling purposes, but 90% of the data on the above drawing is for a standard gauge coupler. There is no information at all concerning the profile of the mating parts which would be the same on the narrow gauge. I realize for strenght requirements that couplers got larger as years went by.
I have never seen a drawing of the typical Sharon coupler used on the D&RGW narrow gauge, sure would like to someday.
Best Regards
Jeff