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 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: 3.12 Main inductance: 6.67mH Secondary resistance: 20.5K Secondary inductance: 41.30H (166-0804): Primary resistance: 4.25 Main inductance: 9.48mH Secondary resistance: 37.85K 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.