Check out full details and more pictures here:
Datsun 240Z 1970-72 Round Top Carb Rebuild Kit Hitachi SU Carburetor NEW 531
Carburetor rebuild kit for Datsun 240Z with stock Hitachi SU carbs (round tops) 1970-73 . Enough parts for two carburetors. Made in japan. What you see in the picture is what you get. Will not fit flat top carburetors. Includes (2) M43 needles and (2) N54 needles.
* The early round top carbs had a shorter seat assembly for the float than this kit provides, this seat is slightly longer but can be used with all 70-72 round tops with a float adjustment.