For what its worth I took a set of 15 x 5 rims off of a 76 Pontiac Ventura.Damn narrow for a stock rim....
Volvo pre-'65. The '65-'70 have lots of vents, the early ones are steelies, 15x4 or 4.5, bolt circle 5x4 1/2" (Ford Mopar AMC). Lots of Studebakers were 15x4.5, same bolt circle.
I can make you 15x4.5 for $65 each retail...you will get 10% HAMB alliance discount off the parts total..Jason I can take plastic and ship international www.earlywheel.com 805-772-7997