As it happens I have a '95 spare parts catalog. The Record and Veloce shifter has 3 G-springs with the same part number as shown in your diagram above. Part numbers for the springs on the Ergo shifters are EC-RE109 and EC-RE110. My 1 8 speed downtube and 3 8 speed Ergo Campy bikes all shift great and it's maybe my favorite group for reliability and ease of setup. Maybe I've been lucky.
Edit - oops realize you're looking for the index ring - SL-RE119 , the MTB thumb shifters (which have 2 springs) have RE-019 ring.
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N = '96 Colnago C40, '04 Wilier Alpe D'Huez, '10 Colnago EPS, '85 Merckx Pro, '89 Merckx Century, '86 Tommasini Professional, '04 Teschner Aero FX Pro, '05 Alan Carbon Cross, '86 De Rosa Professional, '95 Gios Compact Pro, '95 Carrera Zeus, ‘81 Masi Gran Criterium, ‘81 Merckx Pro, ‘89 Cinelli Supercorsa, ‘83 Bianchi Specialissima, ‘VO Randonneur, Ritchey Breakaway Steel, Rivendell Rambouillet, Heron Randonneur, ‘92 Ciöcc Columbus EL