I built some a few years ago for my 790. They were out of solid 1 1/4x1 1/4 square steel sleaved inside of 1 1/2x1 1/2 square tube. The locking device was my own design and worked well. The turn buckles I used for the sway links didn't hold up, I ended up swaping them out for 2 - 1/4" ratcheting chain binders which work awsome. Here are a few pictures, It has been a while but I will answer any questions you may have. I was looking into buying some but they were super expensive (I thought). We did have the pats but we run a farm and the pats didn't work for us. We change too many implements and the pats changes the driveshaft lengths ect, way too much hassle.