Here's a cast iron arc horn that clamps onto the "spiders" of the J-D suspension disks. Rusty and pitted but very solid. Sounds worse than it is. I had to cut through the bolts with a hack saw to get it off the disk, with no damage to the halves. I had a handful of these a while back and they went quickly. I recently stumbled across this one.....chances are it's probably the last one I'll find. $20 + shipping. E-mail with any questions and thanks for looking. I also have some J-D disks if anyone is interested.