This is the four sided red float needle type, especially to combat the ravages of unleaded petrol.  fits:
 
Jetex, spaco Carburettors, and other non-dellorto carburettors.
Indian Lambretta and Vespa Carburettors
These are approximately 1.5mm longer than the standard dellorto needle, as the dellorto type do not seal the hole properly on the above type carbs. 
Price includes VAT @ 20%