We have a version of the Fastway Universal Coupler Lock that has the key number 302 that you are needing with part # FA86-0015-302. view full answer...
The coupler you referenced does not have replacement parts or a latch repair kit so if the thumb latch is busted you will need to replace the unit with the A-Frame Coupler # CA5400.
You can replace it with the same unit, the A-Frame Coupler # CA5400 which has has an oily finish but the same one is available without the oily finish and a black coat of paint, the A-Frame Trailer Coupler # CA-5400-B.
There is another option if you want to go with a different manufacturer, the Fulton A-Frame... view full answer...
Curt has a hitch that fits your 2016 Ford Transit T150 but the # C13900 is not a fit. Instead you would want the part # C14012.
I attached an install video link to this page for you to check out as well. view full answer...