Check out Richard's and Michael Ghia's website
www.performanceghia.com for brake conversions.
You can also check the Tech Article section here on the main page of GermanLook for my brake upgrade article. It has all the measurements and drawings to adapt 944 NA brakes to the front. The rear is a near bolt on if you have IRS. If not get a CB rear disk brake with e-brake.
You can also get Kerscher fronts or even the CB front bake kit. Those are bolt ons. Kerscher now sells their kit with Porsche Boxster calipers. The Kerscher kit has vented disks....it is the only Beetle brake kit with vented disks unless you adapt Porsche parts.
Alex