Off the top of my head the wilwood midilite calipers have dust seals. You have to weigh up how much you use the car then decide whether you need the seals. As for porsche v. wilwood to my mind there's something very comforting about a brand new caliper. I'm looking at this conversion myself but am stumbling over the advantages of vented discs and how to do it well.
Also I believe standard beetle disks, which the disks you suggest look as if they're designed to replace, are 9 or 10mm.
Andy
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