This is a 12Pc kit that includes:
Extended rocker panel set (0848-101, 0848-102) (OEM Type)
Inner rocker panel set (2* 0849-301)
Cab corner set (0848-115, 0848-116)
Floor pan set (0848-221, 0848-222)
Front cab floor supports (2* 0848-311)
Rear cab floor supports (0848-313, 0848-314)

for your

60-66 Chevy & GMC Trucks Rockers Measures about 45" x 10"
Inner Rockers Measures about 42" x 4"
Cab Corners Measures about 13" x 10"
Cab floor supports are the slip-on style

You will receive all 12 pieces with this purchase

We do offer this kit with extended floor pans, see other listings