Dual 320 loader

I just got a dual 320 loader (at least that's what I was told it was) and was wondering if anyone had an owners manual or knew where I could get one. I'm curious how it bolts to the tractor. I was told it came off of a 4010 john Deere but this thing seems like it's a little big for that. Does anyone know much about one of these loaders? Thanks

Dual 320 loader