Just wondering if there are any knowledgeable people on here who know the measurements of the F23 gearbox input shaft splines to size up a clutch plate?

And the other thing is does anyone know if a twin clutch plate set up can be used with Z20LET and F23 box? Weather it will fit in the bell housing ect. Helix do actually sell a 200mm custom flywheel to suit but canít provide me with any info on the twin plate clutch set up and release bearing to fit, and to be honest I donít know where to start looking to find out. Any help would be great!