I've got a set of these, they aren't going to be any good on a 330x32mm Alfa brake disc as they are too thin. These are pretty much a radial mount version of the standard 305mm caliper. In fact they take the exact same brake pad. I think I am going to use them on 305x28mm discs on something or other, not decided yet.
If you wanted to use these on 330mm discs with a custom bracket then the best disc to buy would be the 4x98 PCD Lancia Delta III 1.8 TBI and have it re-drilled to 5x98, at least the centre bore and offset would be correct. Then you just need a pair of radial mount brackets making up. I don't think the pad would sweep all the way to the centre of the disc though.
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