Leaking gas tank filler tubes ?

Its Laysons.

I am guessing it has to be some sort of baffle that was used in the later A bodies. It could be as simple as a flat plate strategically placed in the tank end of the thing, not sure, thus my question. Ive never had a problem with my 73 sport doing this, so I gather it was fixed somehow by ma-mopar.

I figure if I can - I will make the mod myself and save some $ for something that's probably pretty simple to do.

Anybody got a late A and an early A filler tube laying around to compare them ?