Those tin can tanks were original equipment on a lot of 60's and 70's GM vehicles, so a salvage yard search might turn one up on vehicles of those vintages. I think a wrecking yard would just about give one away.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!