Q for SIP - mounting Corsa V50 seat to PX frame

Hi you guys at SIP, or fellow forum-browsers,

I want to mount a Corsa single seat for a smallframe onto my PX.
But it seems that you don’t sell an adaptor plate to mount it, is this correct?

Please help me out as I’ve seen this a million times before but never got to ask anyone how they
did it.

I would be very thankful if anyone had an answer for me.