I recently bought a 69 C10 stepside. The wheels on it are 18x8 with 265/65/r18. If it matters, they are also 6 lug. I’m looking to lower the truck some and I was thinking of putting a set of 20” wheels with a set of low profile tires on. What wheel size will fit this truck front and back and what is the offset? I’m having a hard time finding this info on wheel manufacturers websites. Thanks for your help!