Size of threads on Skyhawk frames?

[MitchP]

I'm looking for these: http://www.ebay.com/sch/items/_W0QQ_nkwZgasQ20capQ20fuelQ20gaugeQQ_armrsZ1QQ_fromZQQ_mdoZ

I was wondering if anyone had the size of the threads on the gas cap for the grubee skyhawk frames?

Maybe you point me to a cap known to work?

 

[runnermike]

Try removing it and taking it to ACE or a hardware store. Might help.