Pirner remote oil filter kit for Nuovo Falcone

Calling anyone familiar with the Nuovo Falcone engine and the Pirner remote oil filter kit.
I have o complete new Pirner kit. Most of its fitment looks straight forward but there is small round blanking plug with an “O” ring fitted. It is intended to fit within the engine and presumably in an oil gallery somewhere.
I’d like to speak to anyone with experience of this kit please. My mobile is 07768958591 or home is 01430 424876,