Complete gear cable (both inner cable, and outer sheath) for all non-handlebar scooters.
For handlebar bikes, purchase inner gear cables (proper housing can be obtained at a bicycle shop - about 72” needed) (requires 2)
Since you’re going to be working on that area anyway, you may want to consider these items:
Inner Gear shift cable only, use Inner Gear Shift Cable; Stella 2T/4T, Vintage Vespas (73"); Sku: 107089 (requires 2)
Complete Shift cable (both inner cable, and outer sheath) use Gear Cable, Complete (Inner and Outer sheath); Vespa, Stella; Sku: 139402 (requires 2)
Complete Clutch cable (both inner cable, and outer sheath) use Complete Clutch Cable; All Models; Sku: CCO2
Inner Clutch cable (inner cable only) use Clutch Cable, Inner (Long); All Models; Sku: ICO2
Tool, Fourth Hand - Cable puller/Holder; Sku: TFH1
Pinchbolt, Standard Cable; Vintage Vespa, Stella 2T/4TSku: 153198
A word of advice:
Within the body of the Vespa, do not remove the complete cable by itself.
You will have a devil of a time trying to trace the path of the existing cable through the body.
Outer Diameter: 0.2 in
Inner Diameter: 0.05 in