Chris P Lewis

If you are silly enough to fuel your Competition model and not reinstall the fuel cap, the Newton A48S (No Lock) or A48L (Locking) will work. This may apply to other models, but I only know this for the 718 Competition. Of course, I was not silly enough to do this...... I am just offering this as a public service announcement.
I think the actual cap is an A400. The other part numbers relate to flange type and locking or not.

4MW

Thanks for the tip. Forgot once and it rattled around in the bay for about 10 laps at Road America.
Been placing it by the rods ever since so I can’t close the deck lid without replacing the fuel cap.