What do you want to use it with? I believe a tiller only needs the front part ( with pulleys straighter than a mower mule drive), but a mover deck needs the entire carriage to hold the deck flat (with proper adjustments).
That’s what i thought. Got the tractor with tiller on it. So that explains why the front mule drive was attached. I thought maybe the rear carriage was not needed. But of course it does. I found a rear mule drive. Near me . Going to get it soon. Just need to see a pic of one on a 1250/1450