You dont run an Extra friction disk in place of the clutch coushin sping. The you just use a normal wider fiber. Where the oem fiber has a larger Inside Diameter so the clutch coushin spring will fit inside of it.
I would run a good clutch and not a no name one. I dont know about there dimpled vs smooth steels. The dimpled steels hold oil wich will allow for smother engagement and possibly a cooler running clutch. Barnet uses dimpled steels for a reason.