Although yours is Cat I (on both ends), the 5240 and 5740 are "Cat II/I". The factory link is Cat I on the tractor end and Cat II on the implement end. You can still get aftermarket, but I had to grind a little to skinny up the tractor end, then I could bush it down to Cat I. The aftermarket Cat II I found (TSC or Runnings, probably) just wouldn't fit between the ears on the tractor.