If someone has a level spacer laying could you please measure the inside diameter and outside diamter of the donuts parts. I am custom CNC plasma cutting some 1/2" 316 Stainless spacers to level the front of a F250 4wd. I can't imgaine I'd need a rubber pad between the spacer and the frame, would I? theres already a pad between the spring and the frame. I am planning on putting the spacer between the rubber pad and frame. Please advise/input please.