These bulbs are manufactured by Narva, a major German original-equipment supplier, with top grade materials and rigid quality standards. They bear the "E-Code" ECE type approval mark, your assurance that they fit, perform, and last exactly as original equipment. For assisting you in selecting the right bulbs, we invite you to use the Miniature, Signal & Festoon page at the Narva Online Catalog.. Quick Reference - 6V / 24V Quick Reference - 12V Metal Base Quick Reference - 12V Wedge Base Note: the above Quick references also contain Japanese Manufactured bulbs. Narva 6-Volt Signal Bulbs Narva 12-Volt Signal Bulbs Narva 24-Volt Signal Bulbs