Both the Curt Trailer Hitch Receiver # C11407 and Draw-Tite Sportframe Trailer Hitch Receiver # 24931 that are confirmed to fit your 2021 Infiniti Q50 are very similar both in how they attach to the overall construction.
We have been able to install both these receivers on a 2018 Infiniti Q50 and we were able to take measurements of the receivers on the vehicle. Both receivers had a hitch pin center hole measurement of 6" from the center of the pin hole to the rear of the bumper. The... view full answer...
For your 2018 Infinity Q50, I recommend the Thule Gateway Pro 2 Bike Rack - Trunk Mount - Adjustable Arms # TH88VR over the Passage # TH910XT. This is due to the integrated cable lock of the Gateway Pro as well as the arms being slightly closer together for smaller frame bikes as well as more space between the bikes. I recommend getting the Thule Passive Security Strap for Trunk Mounted Bike Carriers # TH533 to secure the rack to your vehicle. view full answer...
Realistically the Curt Trailer Hitch Receiver # C11407 and Draw-Tite Trailer Hitch Receiver # 24931 that fit your 2020 Infiniti Q50 have only very slight differences, but I would go with the Curt for a couple different reasons.
One of which is that the Curt has brackets which angle in a bit more, which means a slightly shorter tube so less is going to show. The Curt also has a collar around the receiver and the Draw-Tite does not. This is going to give it an added layer of protection the... view full answer...
The difference is the color of the pin and clips of the two kits. The Patriot Adjustable Hitch Adapter part # PH67SR has black pin and clips whereas the # PH54FR has red ones. view full answer...