Getting back to "trying" to answer your inquiry...
I searched quite a bit and found nothing. So unless you're lucky enough to find a good one in the back of a barn somewhere or run across one in an auction, good luck.
I have to ask - if you don't already have them - have you considered you'll also need the B2579 quick hitch subframe and the B2652 snowblower mounting kit if it doesn't come with the blower?
As much of a PITA your rear snowblower may be I think you're better off with it. Save yourself some time and money and invest in a rear set of hydraulics for chute controls if not already done. Backup camera and mirrors maybe?