Lambretta series 3 all models LI  SX TV GP stand/frame strengthening kit
Kit consists of 
A pair of frame strengthening plates (stainless steel) 5mm thick 
A pair of M8x35  hexagon head bolts (stainless steel) complete with plain washers and Nyloc nuts 
A pair of stand feet pins 6mm diameter x 40mm long self  colour spring steel