A couple Super Bronc questions

Has anyone tried this brake setup? They say it's fits the 40/41 chain sprocket IMG_5196.PNG also does anyone know a decent front brake setup I could use for the front? I know they had the original brake on the clutch but I'm not a fan of a chain between my rear brakes and the ground. Also does anyone have seat covers for this or have an old one that's not tore up or even just th back part of the seat that says "heald super bronc" some jack off cut it off the one I have.