Can be directly replaced and properly matched each time. It has replaced all the old point-type ignition coils on most onans engines instead of solid-state . It is easy to install and simple to operate Made of high-quality materials, it features stability and reliability, and is compatible with or exceeds the standards of the equipment manufacturer. For Onan Points models: , BFA, , BGA, BGE, B43E, B43G, B43M, B48G, CCKA, CCKA, CCKB, NHB, NHE, NHP, N52M Ignition coil replacement #:166-0772, 166-0648, 166-0804, 166-0761, 166-0820 Name:Ignition coil kit 166-0820 is only the same as 541-0522 166-0804 is only the same as 166-0772 points (166-0820): Primary resistance: 3.12Ω Main inductance: 6.67mH Secondary resistance: 20.5KΩ Secondary inductance: 41.30H (166-0804): Primary resistance: 4.25Ω Main inductance: 9.48mH Secondary resistance: 37.85KΩ Secondary inductance: 59.96H Color:As Shown Material:Plastic + metal Package Contents: 1 * Ignition coil kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.