I couldn't ever find those to fit the -12 fittings, they didn't go that big and I tried several suppliers. Well one said they made them but would have to buy a box of 100 and weren't going to do that unless I wanted to buy the box so I went with the seals that PittsburgeRacer is showing from DTI. (i'm trying to look up their contact or Website but not finding them)

Earl's doesn't carry -12 either, they stop at -8 or -10 but don't have for -12 or i would have went with the Stat-o-seals.