Clutch plate sizing

How do you measure the size of the clutch required to fit a flywheel
All help gratefully received ct

 

Measure across the clutch plate or the shiny circle on the flywheel face.
Another clue :

180mm and 200mm (most likely) use M8x20bolts.
215mm (late AS engine) use M7x20 unobtanium.(use specialist suppliers not Halfords.)

 

Thanks for the reply

 

Post a picture of your flywheel with a tape measure across it and someone will tell you !

 

Thanks for the wake up call I miss read the first post