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If you look in a spec. book or the Haynes manual you will see the groups. They are marked 0,1,2, and 3. I can't recall exactly where the marks are but I think the piston marks are stamped in the face. Someone might help you with where to find the marks.
You can assume that the pistons you originally had were all the same size. Once you find the marks on the cylinders you will know if you have a problem. Maybe whoever sold you the one piston can tell you what group it was.
Sorry to make you worry.
-Andy
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72 Carrera RS replica, Spec 911 racer
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