Ignition Coil 300-8M0077471 300-879984T01 339-879984T00 for Mercury Optimax. Perfect fit for specified Mercury engines. Compact design for easy installation and use. Replaceable part numbers: 300-8M0077471, 300-879984T01, 339-879984T00. Fitment: This ignition coil is compatible with Mercury engines from 2004 to present, including: - Mercury EFI 4-Stroke Models: 30/40/50/60 EFI - Mercury Optimax: 75/90/115/125/200/225/250 - Mercury Optimax Pro XS: 115 Pro, 175 Pro, 200 Pro, 225 Pro, 250 Pro - Mercury Optimax Racing: 225 XS, 225 Sport XS, 250 XS, 250 Sport XS, 300 XS - Mercury EFI 2-Stroke Models: 150 (2.5 EFI), 175 (2.5 EFI), 200 (2.5 EFI), 200 (3.0 EFI), 225 (3.0 EFI), 250 (3.0 EFI) - Mercury Racing EFI 2-Stroke: 225X, 300X Color: Black Material: ABS Package Contents: 1 x Ignition Coil Note: Other items not included. Due to lighting and display differences, actual color may vary slightly. Measurement may vary by +/- 1-3 cm.