I just bought a Saren color one:
https://www.ebay.com/itm/Conrad-98000-05-Sarens-Luffing-Help-Sow-Leger-For-Terex-Mobile-Crane-AC-500-1/353200870982There are several currently available on ebay. Get yours if you ever wanted one. I heard it fits the ac1000 so i am willing to try it since the price is not that high. not like the real made for ac1000 jib but better than nothing i guess...
Anyone else has one, please post pic and yr take on how well it works with the ac500 and ac1000. seems like for the ac1000 you have to remove the top boom sections?