Ignition Coil Fits Husqvarna 50 51 55 61 254 257 261 262 266 268 272 272XP Chainsaw, 503 90 14-01 & 544018401 Aftermarket replacement non-original ignition coil. Fits Husqvarna chainsaws: 50, 51, 55, 61, 254, 257, 261, 262, 266, 268, 272 & 272XP. Replaces Husqvarna OEM parts: 503 90 14-01 & 544018401. Please note that it does not support 254XP/262XP/266XP/268XP & 61 w/2 piece coil.