I have gotten two PTC’s through John Cope. One for a 727 and one 904. Very happy with them both. Filled out the spec sheet and even with my “unusual” combo the flash is spot on what I asked for. I did send a sheet directly to PTC, and got a three word email response, that to be brutally honest, was enough to tell me that whoever looked at my sheet had no idea what I was doing with the car. Even though I wrote an essay on the sheet and I know they have built converters for the class. Though to be fair, what I need is pretty unusual, so they are definitely NOT the only ones to not understand. Never received a response from two others I sent sheets into. They were both 9.5”, the 727 flashed to 3340, the 904 flashes to 3500 according to the data.