Hi Rick, that must be a miss-print. The only tanks available are the 75-gal metal examples - it is the only drop tank type used on the original aircraft during its service life, and it is the type of tanks also displayed on the restored aircraft today. I'm very sorry for the confusion!
I believe that text got left in by mistake from the Little Friends I product/manual, where there are some examples which also are fitted with the 108-gal paper tanks, and the Iwo Jima model that is fitted with the large 110-gal metal tanks.