Demon or Duster full vinyl top stud location

Hey guys, my 340 Demon had a factory black vinyl top. Of course the roof was toast so I replaced the roof. I forgot how many studs were used and the placement. Some say 6" apart but do I need 3 or 4 studs on each side? Do I need one near the quarter window and if so, I will need 4 studs? I'm using pop rivets and want to drill the holes before paint. The second photo is where I think they should go.

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