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These are German made forged pistons from Wossner,.. Wossner is a very well known name in Europe as a producer of very high quality forged pistons but is just becoming known here in the US.  These Wossner Forged pistons are a great upgrade for any Opel Astra / Calibra /Kadett / Vectra GSI 2.0Ltr. 16VA 3.Ring.   87 mm bore.  This particular kit fits the C20XE engines found in any Opel Astra / Calibra / Kadett / Vectra GSI 2.0Ltr.   This kit comes with four Pistons that have a low friction skirt coating, four Ring sets , 4 wrist Pins and 4 sets of wrist pin clips.  Part # K9259D200

This picture in this listing is of part number 9005.  It is identical to the K9259 that is for sale here with the only exception being that the 9005 has only 1 Compression ring,.. the K9259 that is for sale here has 2 compression rings and one oil ring as is standard in almost all automotive pistons these days.  There is no other difference.

Engine and Piston specs:

Stroke: 96 
Bore : 88.0mm 
Displacement: 1998 ccm
Wossner Comp. Ratio: 12.5:1 
OE Comp. Ratio: 10.5:1
Piston Weight(grams ): 298