Our OP is of course looking for a non-leather saddle, but for anyone and everyone's edification, 2019's tensioned leather saddle manufacturers include: Berthoud (France), Brooks (UK), Gyes (Taiwan), Ideale (France), Lepper (Netherlands), Nasiruddin (India), Selle Italia (Italy), Selle Anatomica (USA), Selle Monte Grappa (Italy) and Tabor (Portugal).
Nasiruddin's saddles are available in N.A. from Persons.
Gyes manufacturers most of the private label/house brand saddles. To the best of my knowledge Gyes also manufacturers Rivet saddles to Rivet's designs & specifications.