Pistons for EX Engine code

Need help please with reconditioning my engine  

Im trying to rebuild the engine on my Golf mk1 Cab 1990, EX Engine code
Its currently 1800 cc but i would like to increase its cc to 1900 if possible
I cant seem to find any pistons for it anywere at the mo   

HELP Please

Thanks in advance

You wont manage it on pistons alone.
Theres not enough capacity increase from enlarging the bore.
My PB code engine went from 1781 to 1803cc on max overbore, a piddly 22cc increase.
Youre going to need a different crank.