The piston rings are the same as found in a 1.6 vw diesel. However, replacing the rings is pretty much a total rebuild, as your going to have to take the engine out to drop the oil pan and get the rods and pistons out. Changing out the head is easily done in the car. I wouldn't expect it to need rings at just over 100k miles unless it has been abused and not had regular oil changes. Have you done a compression test?
Jason
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