48mm pistons/rings $40 each Have 2

[t20sl]

I have (2) pistons marked "Ausl.   Y10"   on the top with 48. Should be for 100cc Sachs / Penton / DKW etc.. there is a grey (possibly white) dot of paint on them.  They are new with rings in perfect condition.    Anyone have any ideas of how to tell what Sachs they were made for?  They mike 1.888"
Thanks,
Ted  [email protected]

[thrownchain]

What is that in mm ?

[johnborn]

47.9552 mm