I have 5 horn covers all are marked C-L6 maybe there is a C-R6??? but the restoration book says C-L6 and does not mention an "R".
There is a Ford service bulletin from 34 that mentions the horn with the gray diaphram is on the left, it does not mention if it is the high or low tone, all of my 35 horns have black diaphrams. Another service bulletin from 1948 that says the diaphrams thickness high=0.195 and low=0.015 I find some of the horns I have have an additional bell shaped piece under the center bolt of the diaphram??? Over the years I'm sure many of the horns have been taken apart and pieces intermingled, would like to know how to get things back to original.