1990 and older 6cyl had a metal tank, most of them 15 gallons. Everything was poly after that with an internal fuel pump. The 4 cyl already had poly but maybe the size changed there too.
Stainless is softer than normal steel and will offer less protection. If you are worried about rust drill a few drain holes in a new skid and put a few coats of paint on it. The one you have now has lasted 20 years.
Personally I would use the opportunity to get something with serious armor.
"The right to be heard does not necessarily include the right to be taken seriously." —Hubert Humphrey
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