I have what you're talking about. It's made of cast iron, and uses a grade 8 bolt and a keeper pin, instead of the spring mechanism that Pat's uses. I paid about $50 a set to get mine, and that included shipping. I bought a set for myself and a set for Dad. I have a 35HP Kubota and Dad's is a 24 or so HP Kubota. I chose to use them over the all in once quick hitch because our implements (backhoe, two rough cutters, two box blades, 3 straight blades, a tiller, and a post hole digger) are all different sizes and widths, so we would've had to modify them all to use the U shaped quick hitch. I love mine so far. We did find out that they won't work with the backhoe, but neither will the others, since the arms are a perfect fit into the backhoe mounting slots. They work on everything else, and make hooking up MUCH easier. We haven't made spreader bars to hold the links the right distance apart yet, so I just reach behind me, and move one of the bars if I need to, while backing up. Once under the pins, just raise the lift and it engages. You still have to jump off to put in the bolts, pins, connect the top link and PTO (if necessary), but it takes all the work out of hooking up the lower links. They were definitely worth the money to me. They come with washers to use as shims, and there is a little slop between them and the arm, but to me it's not noticeable. It doesn't seem to move any more now than it did before, especially since I leave a little slack in my lower arm links so that the implement can move a little if it hits something solid.
Cliff notes: I've got a set, Dad has a set, and they work great!
