I know 4 catalytic database, where you can find a price for converter from your vehicle with exhoust serial number or car model
1. fso.hu - hungarian database site
2. catalog.mairec.com - Germany site wit about 5000 unique numbers. Need request for admin to registration.
3. ecotradegroup.com - database with about 15000 unique numbers. Paid access to the database.
4. mycatalyst.ru - Belarus database. About 18000 records.