Created this for a Coworkers 4th Gen Dodge Ram (2009-2018) truck as he got a spray in bed liner and the factory body plug would no longer fit due to the additional thickness of the bed liner. the factory part says 50x70 on it.
I printed it form SainSmart TPU at 0.20 layer, no supports, no brim, on Prusa Mk3 with gluestick on factory smooth PEI sheet.
Worked great - snapped in hard.
Fusion360 file included if you want to tweak it for your own application.