I measured my rolls. they are 1 1/2". I just sawed 2 pcs of 1 1/2 steel tubing. I ordered 2 Eiko 1007 bulbs w/ bases for $7 shipped. I have no plan yet until I see a bunch of components in front of me. My plan is to make Backup lights. the miniature 1007's are 55 watts each. I will keep looking for different mounting options if the Steel tubing slides inside the rolls tonight. I will post if I have any progress.