For anyone interested. I just purchased a very new Atlas 4” Jackplate from a fellow on S & F for 785 shipped. He had 2 of them and has one left. The story is they were bought for a twin rig, used once and immediately taken off. Mine looks brand new and is going on my 184. The actual setback measures at 5” when measured on the bench. I know it’s not a bobs but is still a good deal for someone.