I contacted RA to inform them and this is the reply I got.

Thank you for bringing this to our attention. I did look into this and confirmed that the hitch we have listed would not work for any Ram 50. This part will be removed from our listings for this vehicle. Curt will also be notified. I do not have a hitch right now that would fit this vehicle, but hopefully Curt is able to make or find an existing part that does fit and add it to their listings when they upload their next application data charts. Once we have a part that fits this vehicle, we will list on our website but I unfortunately do not have a time frame for if / when that would occur. We apologize for any inconvenience that this may have caused you.

Thank you,

Zachary
RockAuto Customer Service