Just a word, make sure that you do your homework on which coil you need. The 285cd, 298xp, 1100cd, 2100 (xp nd CD), 2101 are all based on the same saw but even they have differences in flywheels and ignitions. I doubt that the 77cc saws 77, 180, 280, 380, and 480 share the same ignition.. they are very similar looking but do have a different case and crankshaft diameter. I have to admit I'm not positive, though. The good news is that Husqvarna does a very nice job on their website of providing illustrated parts lists and part numbers. These parts are not that easy to find and they are fairly expensive. The saws are really worth it, though.. perfect milling saws. Patience and tenacity will win the day.
Oh, Andy is right, the 056 is a Stihl, don't bother with it. Search the site, there's some good information here.