From the measurements I have taken, the width increase should be the same. You can swap the beetle arms for the 86 AL arms and you should have no increase in trace width with the 944 N/A brakes.
With the Turbo brakes you should not have any further increase with the AL arms. Its the disk thickness that is 24mm for the rear and the part of the rotor that mates to the hub should be the same thickness as the 944 N/A rotor so you should be good to go.
I will be doing this same swap winter 2003.
Sandeep
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