Compatible with models:

Vespa 150 GS (Model VS5T)
Vespa 160 GS (Model VSB1T)
Vespa 180 SS (Super Sport - Model VSC1T)

Also compatible with:
Vespa 150 VBA / VBB
Vespa 150 GL (VLA1T)
Vespa 150 VGLA / VGLB
Vespa 125 GT (VNL2T)