Lambretta 49 tooth first gear by Casa LambrettaReproduction of the first gear for the series 2 and 3 TV 175 and SX 20049 teeth.Sourced in Italy!
The Complete Spanner's Manual: Lambretta Scooters by Martin 'Sticky' Round Third Edition 8100072
The Complete Spanner's Lambretta Kit Book
Eibar Lambrettas 1954-1989 by Jaime de Prat Salomone
The Unofficial Lambretta Manual Update by Mark Haines