I purchased a 1 5/8" holes saw to cut the holes for the new interior lamps. Let me tell you, it was not an easy task installing them. I used a rat tail file to remove all the extra plastic, crimped the new light holder tabs down, and still had a difficult time installing them. I think that 1 3/4" would have been too big a hole. I also used a die grinder to cut out the hole for the roll bar.
