What are the wheel spacers I should buy for my 1998 ram 2500 cummins wheel spacers? Hub hubcentric or non hubcentric? Kinda confused my wheels don't sit on the lip at all.

 

There is a difference between wheel spacers, and hub centric rings. Wheel spacers are used to move the wheel assembly out away from suspension parts. Hub centric rings help keep the wheel assembly from moving. Commonly used to solve vibration issues.