Sachs 125 pistons

[Koen Cuypers]

I'm looking for quality pistons for my Sachs 125 engines.
The type of engine is a Sachs 1251/5B (aluminum cast).
Piston Type: Sachs 068207015-16-17-18 or 0686207025-26-27-28
There is a difference in pistons for aluminum and iron cast cylinders. In the Pistons for the aluminum cast cylinders, there is a difference in pistons with 1 upper L-ring and two rings (1 L and a second normal ring)?
Apply these two types Pistons to a specific type cylinder or they may be used anywhere?[
What is your preference?
Sachs Pistons

Thanks, CK