I have purchased a hardtop from 427 Hardtops Limited. They mention that the newer thinner MkIV bars won't work under that top. They mention using the Breeze bars. If I'm going to do all that, I really prefer the look of the 2" MkIII bars so I'll go that route. 'Hoping' that someone on here will have done EXACTLY this for this purpose but if not.. just inquiring about the process to use the thicker bars. I know that the body openings will have to be modified which isn't an issue. I guess I should ask first if the thicker bars are even still available to purchase or if I'll have to have some made?