1988 Atk 406 Cal Fab Swingarm.  Manufactured 1 year only from ATK if your looking at this you already know that Was on my 1988 that was converted to hill clim bike nice shape has some rash by shock mount as shown in picture does no effect swingarm with tensioners and guide been sitting forever could use new bearings on pivot threads are all nice if your looking this was only used on 1988 nice long gone piece if you want the shock I'll include it probably needs rebuilt make an offer if intrested I have a few nice 406 clutch assy thanks