It should come with a bushing for the inside shaft/tube.
You can use a L bracket, clamp and a couple of bolts to secure it to the floorboard. Some aftermarket suppliers sell a kit but you can make it up as well.
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