Aftermarket locking gas caps that work for Flip-Top cap cars

If you have an aftermarket inner locking cap & you know it works for any of the following applications with exterior flip-top caps please list the vendor name & part number for each application?

1967 - 69 Barracuda

1968 - 70 Charger

1970 Challenger

1971 Challenger

I know that the 1970 / 1971 Challenger fill tubes are different, are there any differences in the Barracudas & Chargers listed that would require a different aftermarket cap for each year / model? (if so, I can edit the list)

Layson's Restorations part# RD-25881 fits.....

67-69 Barracuda
68-70 Dodge Charger
67 Plymouth GTX

cap? There is an "insert" you can buy. It drops down the filler whole. Then you close the cap. My 69 S/E had one.

I am looking for the numbers for the auto parts store variety.

This thread has some info on Challenger aftermarket caps-

https://board.moparts.org/ubbthreads/ubbt...challenger.html