I recently upgraded my alternator to the 700$ nations alternator. This one worked great and is sitting in the nations box ready to ship out. It was on a 3.5 Ecoboost but I think it fits the 3.7 as well. Would be good for a spare if someone is pushing theirs pretty hard and spends time very remote or for whatever other reason. I think this is 300$ for the OEM brand new.

70$ + Shipping. Let me know if you have any questions. Happy to send photos.