Is there such a thing as a 16gal tank that fits our cougars? Way back when I bought my cougar it seems I remember the guy telling me it had the wrong tank. I fill it and the guage only reads just above half and I get only about 14 gals in it from empty, I ran out of gas the other day and it inspired me to fix this issue I've delt with for the past 15yrs. This tank has a drain plug in the front corner, it doesn't stick up in trunk like my friends 69 mustang's tank. Thinking it maybe came out an early 6 cylinder mustang or cougar? I don't mind it being small, (more room in trunk) but I need the sending unit to match it. PS Something about the filler neck seems odd too.