A firm called ZS 'Jezów', in Polish Lower Silesia,
is the Type Certificate holder for this aircraft.

Their main office is in Bielsko-Biala - where the owner
lives.

I suggest contacting (in English) a Mrs. V. Mynarska
- at the Bielsko office )
- and all will be well.
Contacting the factory directly (especially in English)
can, occasionally, disappoint.

Be aware that there is a _ between 'szd' and 'bielsko',
which is obscured by the automatic underlining !

Stan.
UK.