fuel filler pipe twist-on cap

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In one of e-bay's spam mail, saw this:

http://www.cjponyparts.com/scott-drake-gas-cap-pop-open-1971-1973/p/GC713PSD/

Never seen that little twist-on cap. cjp does not sell it alone.

Any idea where I could order one (or even better, one you could lock)?
I have this one - http://www.virginiaclassicmustang.com/71-73-POP-OFF-GAS-CAP-ALSO-WILL-FIT-65-66-MODEL-P2288.aspx 

Came with this style of inner twist-off cap - https://www.npdlink.com/store/products/gas_cap_replacement_style_vented-106679-1.html

I haven't found an inner twist-off cap with those slots that fits. Tried a few at NAPA, but only had one that was very close, but was just a little too small.

 
This looks to be a replacement of the fuel cap on itself.

What we would need is a cylinder that fits the tube and have a shape that prevent it can fall into tube and be just level with cap base so you can close.

This last point only means probably the modification of the filler tube so you can insert something deep enough and that it can't go further down/get stuck into the tube

 
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