You can easily find and buy Campagnolo replacement pads for your brakset from eBay sellers.
Those pads aren't anything rare or unique in the Campagnolo product line and was used on many brakeset models for many years. Just shop by sight and you can easily find a match for those pads.
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72 Line Seeker
83 Davidson Signature
84 Peugeot PSV
84 Peugeot PY10FC
84 Gitane Tour de France.
85 Vitus Plus Carbone 7
86 ALAN Record Carbonio
86 Medici Aerodynamic (Project)
88 Pinarello Montello
89 Bottecchia Professional Chorus SL
95 Trek 5500 OCLV (Project)