Advice asked for widthening rims on a 70 Duster

There are several 15 inch SBP wheels available from Summit. Use 5x101.6mm as the bolt pattern, they don't list a 5x4 inch pattern. They also offer BF Goodrich and Cooper tires in 235-60-14 if you want to stay with your 14 inch wheels.

I don't know if they ship to the Netherlands, but I'm sure there are ways around that issue.