You have to be more specific about your model with 350's.
Part # 18233-318-000 (COLLAR, EX. PIPE JOINT) is same for
CB350G A MOTORCYCLE, JPN, VIN# CB350-5000001
CB350K3 A MOTORCYCLE, JPN, VIN# CB350-3000001
CB350K4 A MOTORCYCLE, JPN, VIN# CB350-4000001
CL350K2 A MOTORCYCLE, JPN, VIN# CL350-2000001
CL350K3 A MOTORCYCLE, JPN, VIN# CL350-3000001
CL350K4 A MOTORCYCLE, JPN, VIN# CL350-4000001
CL350K5 A MOTORCYCLE, JPN, VIN# CL350-5000001