When you run 3/4" to 1 1/2" wheel spacers the caps ( grease cap and wheel center cap) do not interfere with each other. Use Press in 3" or 3 1/2" Studs in your hub or Brake Rotor.
(these Crusty OE MoPar Brakes are no longer on the car - Baer 13" Rotors with 6P calipers reside there now) You can also Stack spacers to get the Offset you need. 1/2" 3/4" 1/4" 3/8" etc. Sometimes if I change wheels I change the Spacer stack as well.
Some illustrations:
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Cheers! Greg
