[DFW02S]

Stock offset on the 10" rear is 47, not sure 60's would work without a 15mm spacer. There is very little room between the tire edge and strut.
Fronts would probably work, stock is 8" and 50 et.

How about this wheel? It's 27 lbs but it fits.
http://www.tirerack.com/wheels/WheelCloseUpServlet?target=runWheelSearch&initialPartNumber=CUP488054S&wheelMake=Sport+Edition&wheelModel=Cup+4&wheelFinish=Silver+Painted&showRear=yes&selectedRear=CUP481040S&autoMake=Porsche&autoModel=Boxster+S&autoYear=2002&autoModClar=&filterFinish=All&filterSize=All&filterBrand=All&filterSpecial=true&filterNew=All&filterWeight=All&sort=Brand