What size tire on a 15x4 inch rim ?

Demonracer said

One my street cars I ran a 185/80 15, I believe they were made for Volvos. I found that the 185 had better street manners than the 165 on wet roads.

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Tiresize.com says they don't exist either.
Summit sells some, made by Coker, even have a redline on em. NOT cheap! ($282)
(They did get a good review from a Porsche 356 driver)
185/65x15s available everywhere, I put a pair on 15x3.5 centerlines. Decent tire, but real short!
EBay motors shows at least two brands of 185/80x15s, as little as $51ea.