what are you handling? if you want to handle two round bales, go for a miller grab tec grapple. I bought a bucket and grapple new last year , cost $9,500 

if not,   I have a sturdy rylind grapple currently on a bucket for a case W 20c loader I would sell.  you would have to weld two brackets to your bucket.  or  I also have a 621b plain bucket available off one my dad had that had a cab fire. I am 5 hours from desmoines.

 https://rylind.com/product_category/buckets/