Note: these are VERTEX OEM rings.
Early versions had a silver upper ring.. this has been discontinued
by TOMOS and VERTEX (the manufacturer).
Firstly; All our A55 pistons and piston rings are exclusively Vertex.
From the beginning of the engine A55 (2004) until the end of 2006, piston rings were installed that were not the same as from 2007 onwards.
At the beginning (typically only Revival) (until the end of 2006), the upper and lower piston ring were trapezoidal. The top was chrome-plated. The bottom was not chromed.
The codes were:
- 233707….upper. Unfortunately, these piston rings are no longer available. Replace complete piston kit PN-105
Since the beginning of 2007, they are equal to the upper and lower (square shape of 1.5 x 1.5 mm) (vertex brand ) With us always and only Vertex for A55