I think I am right about this.....I was replacing all the slider blocks on the conquest which was a lot more work than I thought (but thats another story). I got the double chains connecting the 2nd row of wheels and 3rd row. I believe this is a double 50 chain. I couldn't find the master link then I noticed the outer plate was sitting on the inside of the frame and I was thinking impossible. There was no retaining clip to be found. I have no idea how long it has been like this since I just bought the machine.

To my surprise the opposite chain was also missing the retaining clip but the plate was there. Fortunately my local hardware store actually sells the clips for these chains and I bought two.

The rest of the chains all had the retainers. No idea why these either broke off or were never put on but I was VERY shocked and thinking if they came off it probably would not have been a good thing.