Bob,
Currently all that is available are good used ones. Try some of the suppliers in the back of the Riview like Wheatbelt, Speedway or Larry Daisy. They should be able to help you out. I used Tank Renu for a 48 Cadillac a number of years ago, worked out OK.
Thanks,
Tim
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Tim McCluskey
Maplewood, Minnesota
ROA 9686 BCA 39089
1963 Riviera (Blue)
1963 Riviera (Black)
1985 Riviera T Type (White)