Why bother? The AE101 discs are 4x100 not 4x114.3, and the superstrut conversion will fit under 15" rims but only if you do use a smaller caliper mount a-la the AE92.
If you are after bang for buck then sourcing LN106 calipers and Peugot discs is cheaper than sourcing even the Superstrut calipers let alone the GT4 discs. If money is less of an object then the S4 RX7 calipers adapt up to most things very nicely.
Anyway from memory the Peugot 604 disc shoudl fit perfectly, 20mm wide. But making up all the brackets for the Superstrut calipers seems very pointless when you may as well make them up for the RX7 calipers (probably easier to find S4/5 calipers too).
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