Lambretta headlamp bottom adjuster & 3.5 mm screw as original for Li Special, TV, SX & GP INNOCENTI # 19780009
See fig. 22 & 23 in the image below.
PRE ORDER FOR The Complete Spanner's Manual: Lambretta Scooters by Martin 'Sticky' Round (Author) Third Edition
LAMBRETTA - ILLUSTRATED GUIDE TO THE IDENTIFICATION by Vittorio Tessera
Lambretta Concessionaires The Complete Story 1951 to 1971 | by Stuart Owen
The Unofficial Lambretta Manual Update by Mark Haines