My Yakima Rocketbox rooftop carrier from the 1990's still functions, but the front latch toggle base broke a while back, and the latch is key to prevent water leaking in.  I used the rear latch part as a model, and designed this replacement.  I used Bambu PETG HF in a 100% infill, printed lying on one side, with supports enabled.  The holes are 3/16" diameter, intended for aluminum pop-rivets.   Note that the outer half of the latch (in photos in dark gray) is the original part.   The factory part snaps into the upper portion of the latch base with a little force.