Hi , I'm new to the forum, I replaced the Vinyl top on my 66 and the S bars have a self threading 7/16 nuts behind the back of the bars(4). The interior panel where lights are will need to be removed and trim panel that holds it down to remove nut at the far rear. You will need a little help with that one so as not to break S bar where small end is on outside, very fragile. Use help putting S bar back on, these bars are not cheap. While at it if medations need replacing nows the time to do it. Use new nuts when replacing S bar, new ones will not have a sealer on them and will need some type of caulking on back side of nut to seal it up.
