Here is a setup I made for a friend of mine on his Kioti fel bucket. He lifted some 12" Dia. logs about 12' long.
I am going to do a similar setup on my JD 2305 fel bucket, when I get some free time.
Weld on hooks are 3/8 and weld D rings are 2" ID.
Also used 1/2" x 2" Hot Rolled Flat Steel both sides of bucket
8 - 1/2-20 x 3" Grade 8 bolts with nylon locking nuts.
Tig Welded hooks and D-rings.