Thanks for hints to everyone. I have these lug nuts, as you post in the picture. I might prefer to change drum then add spacer and longer studs. My theory is, that Magnum 500s will seat properly on the new drum and even the hub will fit centre bore diameter of 2.125 inch at correct distance from the drum.

Anyone can confirm correct fitment, having the drum Raybestos Part # 1924R with the Magnum 500s?