Does anyone know what the PCD (pitch circle diameter) of an 02 WRX Wagon would be. I am guessing it is 5x100 48mm offset. Is that correct?

Actually the stock rims are 53mm offset, but you got the 5x100 part right.

Doesn't PCD refer to the center bore of the rim? Like 56.1mm for Subies in general. I don't know, that's just what I thought. Brian

Doesn't PCD refer to the center bore of the rim? Like 56.1mm for Subies in general.
PCD is the bolt pattern.

Hubcentric measurement is the center bore (56.xx mm).