What Pin Box Does The Curt Helux Pin Box C63RJ Replace?

Updated 11/03/2025 | Published 01/26/2025

Question:

Does it fit to replace a 1621 HD? If so, is it compatible with the Curt Crosswing?

asked by: Sean W

Expert Reply:

Hello Sean, thanks for reaching out. The Curt Helux Shock-Absorbing 5th Wheel Pin Box # C63RJ replaces the Lippert Rhino Box pin box, not the 1621 HD. I actually asked Curt about this 2 weeks ago and they said right now they are only doing the Helux for the Rhino Box, but they do hope to add more fits such as the 1621 a bit later.

To answer your other question, the Helux pin box can be used with the Curt CrossWing 5th wheel hitch.

expert reply by: Jesse M

Jesse M.

11/3/2025

Hey Sean, were you able to find a pin box that fits your 1621 HD setup? Knowing what worked could help others trying to pair their hitch with the Curt CrossWing too.