Mine came on the tractor. I've never researched any aftermarket ones. I put one on my old 322 years ago that I bought used from a JD dealer. I don't think you would gain anything with Cat 1. I'm afraid Cat 1 attachments would have the pins too far apart and the height of the top link would be too great to work properly on the 455 3pt. I will add, on the factory 455 3pt at least.