Buell Xl , black replacement cylinder ( x1 ) 

with late style bigger cooling fins ( 04-21 XL / XB ) for better cooling

sold a piece, 

need to be finished bored and  honed to piston size 

Stock replacement aluminum cylinder with cast iron liner. Stock 3-1/2" bore. Stock 4.650" length. Repl. for 04- up XL and All XB 9 and XB 12 models  

Note: Cylinders must be finish bored and honed 

comes with out piston and rings