My next project is to build a diamond plate fuel tank for my flat bottom boat. I found all the supplies but can’t find a nice looking 2” vented aluminum cap. I can find motor cycle grade caps but they are all 1 5/16” very small to try to fill with a gas can if needed. Any ideas where to look? I’ve spent hours online looking but can’t find anything that works. If not a vented cap, a vent for the fuel tank. I can find vents, again looking for something that looks nice enough to go on a diamond plate aluminum fuel tank. It’s not covered up and is exposed so has to look nice and be functional.