DR 177 - vespa GT 1964

Hi

I am looking for a DR 177 Racing cylinder for my 125 GT 1964

only one model on sip's website :

Racing cylinder 177cc DR Vespa
PX125/150, d=63mm, incl.
cylinder head

It's the same for PX and oldies ... and for oldies it's fully plug and play ??? [*-)]

Thx