Try calling these folks. They are used by a lot of us for various other parts and they may have specific experience with this kind of upgrade on vanagons.
http://www.autohausaz.com/audi-auto-parts/audi-5000s-brake_rotors-replacement.html

bob

> Is there any good way to upgrade the brakes on my '84 Westy without
> braking the piggy bank?

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