GY6B 125cc-200cc Dr Pulley Sliders CF Moto E Charm, ITA 150 SYM HD200, Puma, Znen 16 inch Wheels

The GY6B engine can be air cooled or Liquid Cooled like the CF Motp E Charm, CPI GTR 150, SYM 200 HD200 or Air Cooled like The ITA 150 plus Puma and all Znen scooters with 16 inch wheels which most use the 906 size belt but use the GY6 Clutch and Bell like the 181401 Dr Pulley Clutch and Bell.

The biggest clue here is the 16 inch wheels which need the taller 123mm variator and larger 20X15 weights to push ramp plate in to raise the belt.

Some Honda models also with the larger wheels will use 20X15 weights like the SH150 and 125 Aprillia Scarabeo butr not the PCX which uses 21X15

Its has been like this for a long time.