OPTIMAL BP-10421 Fren Sistemleri Fren Balatası, AUDI A3 (8L1), AUDI TT (8N3), AUDI TT Roadster (8N9), SKODA OCTAVIA I (1U2), SKODA OCTAVIA I Combi (1U5), SKODA OCTAVIA II (1Z3), SKODA OCTAVIA I Kombi van (1U5), VW GOLF IV (1J1), VW NEW BEETLE (9C1, 1C1), VW BORA I (1J2), VW BORA Variant (1J6), VW GOLF IV Variant (1J5), VW POLO IV (9N_, 9A_), VW NEW BEETLE Cabrio (1Y7), VW POLO IV Sedan (9A4, 9A2, 9N2, 9A6), VW GOLF III (1H1), VW BORA (9M2), VW GOLF IV Van (1J1), VW POLO IV Sedan (9N2, 9N4), VW POLO Van Kombi van (6V5) modelleri ile uyumludur.