List of Honda throttle body sizes
d15b7 - 56mm
d16a6 - 55mm
d16y7 - 56mm
d16y8 - 56mm
d16z6 - 56mm
ZC - 55mm
d16a1 - 55mm
d16a8 - 55mm
b18c1 - 60mm
b18c5 - 62mm
b18a - 58mm
b18b - 60mm
b16a SiR - 58mm
b16a Sir2 - 60mm
b16a2 - 60mm
b16a3 - 60mm
b20b - 60mm
b20z - 60mm
h22a - 60mm
h23a - 60mm
f20c - 62mm
f22 - 60mm
f23 - 60mm