This is gonna sound stupid, but, I know they are available because I bought the entire system for a freind of mine 2 years ago, however I could not find any info under the attachment section on the JD site, I would suggest you try the JD athorized dealer.
Now for the bad news, I had it here last year for servicing, & woke to a major storm, I thought it would be a good time to try it out, "I was not impressed" I found it had no steering with the blower down, & no traction with it up, yes we had wheel weights & chains, but that is just my opinion, the snow was wet & heavy, maybe you have drier snow in your area. Hope this helps.
Michael ::smile: