When I restored my boat I bought a new filler neck and cap to replace the original. The hole cut out was to big for the new setup and the bolt holes for the new one didn't have anything to grab. I thought well I'll use just the cap then because it's shiney lol. Well the new cap wouldn't screw into the original neck. They appeared to be identical but the threads were different.
84 Supra Marauder
Monster Tower
Monster Cargo Bimini
4 Kenwood Tower speakers (6.5)
4 Kenwood Interior Speakers (6.5)
2 Kenwood 6x9 rear seat kick panel
2 Kenwood 5 1/4 in dash
1 Kenwood Sub
2 2ch Kenwood amp 1 2ch Fosgate amp
2 4ch Kenwood amp 1 4ch Fosgate amp
1 2ch Kenwood (bridged) for sub
STRAIGHT OVER KILL.