Lee,
The whole premise of this aftermarket stuff is that it is supposed to be a bolt on otherwise we could go to Pick Your Part and get something and make it work. I don't have any problem making them squirm by stopping payment on the credit card. That usually gets their attention. I can't tell how many times I've taken something back to the Truck Shop that was in no way going to work and have them tell me that it's the first time they heard of the problem. Bull! Good luck with the conversion, I hope it works out.
Fred