what size is my clutch

[az1966]

need a clutch job bad,, problem is when I check for parts I don't know if I need parts for 8 1/2, 9, or 10 inch plates and such,, I 'd like to order all the parts in advance so as not to have car down for to long its a 66 stang,200 ci motor, 2.77, 3 spd manual tranny also any recommended parts to buy to ice the jobe so I'm not going back in inbout 6 months or so

thanks for help/info