I can confirm that the base front calipers will fit on the back of a 996 carrier. It should fit the rear of a 986 S too. I can't say how well it will work though. The front base caliper does have much larger Pistons than the rear S caliper.
The rear base calipers won't fit over the S rotor because of the pins that hold the pads. Maybe if you ground the pins down, the base caliper would fit over the S rotor.
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Woody
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