The International Cessna^® 170 Association

I just installed a Zeftronics R15V00 alternator controller in my 170A. I just noticed on the STC Product Eligibility sheet that the 170 is not listed. My IA informed me that I need to file a 337 for this, but I'm afraid that since the STC doesn't list the 170, I could get into a hassle. Has anyone else had this problem? Any suggestions on how to proceed?

Patrick Mahaffey
170A 1410D
Grand Prairie TX

Pat, scores have been installed per field approvals, and Zeftronics can be very helpful. They have a website, and are located in Longview TX.
Most of their units are FAA-PMA and therefore do not require STC.