Control code (arrow 2) (it doesn't matter for repair work, you shouldn't pay attention to this code).
The number of holes codes the thickness of the gasket (arrow 3).
Piston and cylinder dimensions
| Size | Piston diameter | Cylinder diameter |
| Nominal size | 79.47 mm | 79.51 mm |
| 1st repair size | 79.72 mm | 79.76 mm |
| II repair size | 79.97 mm | 80.01 mm |
| Gap | 0.03 mm | 0.03 mm |
(The original information is posted on the resource: vwmanual.ru)
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