I had the same issue with my s chassis, lots of cancer spots around the sunroof. As far as advice, I took matters into my own hands and used a die cutter, chopped out the rusted areas and spot welded in new metal... It worked pretty good and looks flawless after some sanding and some small amounts of filler to even things out.
Bigsyke is right though... it may look like you have only small amounts of rust spots but once you start removing it you may end up cutting large portions of your roof off that is infected underneath.
If diy isnt your type of thing I was quoted about 200 bucks to fix mine by a local body.
Jus to give you an idea...
Good luck
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