Rebuilt sandcast Solex 40 PII carburetor set.  Commonly known as “four bolt” carburetors to note these take the air cleaners or velocity stacks with four bolt attachment.  Correct for 550 Spyder, 1956 and early 1957 356 547/1 Carrera engines.  Sold as a set of two only. Comes with correct throttle arms for horizontal style linkage.