I have started making silencer end caps, I started with ZX750 Turbo, but am now looking to expand into GPZ1100, GPZ750 and GPZ550 all standard Kawasaki systems. My question is if any body owns any of these bikes here in the UK or over seas if they could measure the end caps outside dimension and centre hole size on their bike and the model and country it would help me a great deal for my data base. I have attached the ZX750 turbo type that also coverts NA750 silencers to turbo made out of stainless steel.