I'm sure this will work for other cars, but this is specifically the kind that pops into the back of the gas cap and attaches to the door. 

I've included the Fusion 360 file and a STEP file in case you want to modify it.

EDIT: Added my 3mf file because I forgot to mention print settings.

I used a 0.6mm nozzle w/ the “0.20mm DETAIL” setting and the Organic Supports in PrusaSlicer 2.6 alpha 6 in order to print this. The supports came off pretty easily with some needle nose pliers

UPDATE: Added a “Stronger” version that's designed to be printed on its side in order for the layer lines to go horizontally (original version broke along layer lines in my car when I pulled on it a bit hard)