S2/S3 Fulvias :- A good idea before you haul the brake shoes off the back-plate, is to make a little sketch of what shoe goes where in relation to cam levers, return springs, and pad material on the shoes, etc. All four shoes are different - leading and trailing, right hand side; and leading and trailing, left hand side. None are inter-changeable (without some modification?).
Regards - Roddy Young