The fronts from an S will fit a base just fine (you'll also need the rotors) but the rears won't fit unless you modify the base's e-brakes.
Happy Boxstering
Pedro
I was going to put them on my 03 Base but have decided against it. They likely work fine but need lots of cleaning and probably a paint job. I machined the rotors, the fronts are probably usable, not so sure about the rears.
The calipers have pads and sensors, and I have a bag of what I presume is mounting hardware.
$700 shipped for everything.
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