I recently replaced a clutch on what appears to be an original 55-2 with a V-8. It was an 11" unit. I wouldn't buy any parts until I removed it to be sure.
Fred


1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine