Blank rotors

[Wally]

No, not that I know if I understand your question properly.
Only blanks you can buy are stock front beetle/Ghia disks/rotors (with VW bearing sizes). For using the alu 944 bearing housings you will always need bearing spacers/adapters afaik.

Still, your question leaves more questions as to what you exactly mean: Porsche bearing housings aways have the studs pressed in, so 'blank rotors' for a 1985 944 are a strange thing to ask? Front/rear? what bearing houses: VW or Porsche etc etc.