Re: omc metal gas tanks
before Boater's World went out of business, they had new metal OMC tanks; I think they ran about $70.
The price is one reason they make plastic tanks now.
PLastic tanks aren't as hard on your boat deck and toes. Especially around salt water, the bottom rim can rust. They are also lighter.
Metal tanks can rust in the inside bottom.
But I like them and have my old one from 1964. Saving it for when I restore my old Whaler it came with.