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1987 944S piston rings

Engine

Vehicle Information: Model(924/944/968): 944s; Year: 1987; Body Type: Coupe; Total Mileage: 137km;

There are two types of (standard bore size of 100MM)pistons available for this model. Mahle and k&s or Klobenschmidt. The mahle I believe had the piston rings sizes 100MM x 1.75mm x 2.0mm x 3.0mm which I purchased but are the wrong size and are two big.I believe I have the K&S type piston but there are no markings to confirm this. My question is are the rings smaller between the two pistons? I noticed on one supplier site they offered ring sizes of 100MM x 1.50mm x 1.75mm x 3.0mm. Can you confirm if these are the rings sizes I need?

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