After a lot of mileage or frequent introduction to curbs, wheel stands or general abuse your front fork suspension may just leak, fail and generally decide to stop the boing-boing in your scooter life. Tell-tale signs that your current ones require replacing including bottoming-out at road bumps, oil leaks on the lower part of your shocks, and excessive travel (especially when using front brake).
Replacing your scooter's worn front shocks with these new items will restore handling and improve braking performance and safety.
This is for one unit (your bike uses two) and suits the scooters below:
Yamaha Vino (all 2 stroke, including 5AU, SA10J)
Suzuki Address, Sepia (2 stroke including AD50, AJ50, AP50) with this style of front suspension (trailing link) - note these are a little shorter than stock, but do fit
Suzuki Address V100 (AG100)
Qingqi QM50QT-B2 50cc 2-stroke scooter
And others that use similar front suspension units. Length between mount bolts is 220mm, mount bolt diameter is 8mm