David As far as I know, there never has been a shoulder harness STC for Ercoupes, Forneys, Alons, etc. I have a 337 (field approval) for one in my 415-D that I will gladly send you. You can use this for the basis of your own field approval. I have already sent quite a few out to others on the mailing list.
Syd Cohen NC94196
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