2006 Lotus Elise, Ardent Red/Magnolia, Touring, Sport, Hard top, Traction Control, Limited Slip, 1 o
I did that particular mod to my top some time ago. The exact size of the wellnuts(or rawl nuts), I don't recall. The size is somewhat determined by the bolt size. You may want to check out your local Ace hardware and go through their hardware selection. I have found various size well nuts there for assorted projects. Don't forget to take one of the bolts with you. Give them a shot.