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Old 10-22-2013, 10:11 PM
97 SL320 97 SL320 is offline
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Join Date: Jan 2012
Posts: 7,515
I'm thinking that the seller mixed piston versions. Sometimes pistons have version differences and are intended to be replaced in sets.

I'd return them for a closer matched set.

However, you can easily pull weight from the heavy ones. Chuck it in a 4 jaw lathe chuck with the crown towards the chuck. Run a cutter from the skirt side towards the crown. Have a look at the inside diameter from the skirt side , you will see a cut ring. When removing weight cut only towards the crown and don't increase the diameter.
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