2012 Hustler FasTrack SuperDuty 54" - Retailer won't tell me mower blades I can use

Hi all. I need to know what blades I can use on my 54" FasTrack SuperDuty (model year 2012, model # 930149). I have been given the run-around by Hustler and by the retailer from whom we purchased our mower. They will not tell us the part number/blade type that is suitable for our mower. The owner's manual says the mower requires a specific blade and to "contact the retailer" to find out which one. So I'm being held hostage. The retailer is too far from me to drive to at this point. I need to find these blades somewhere online or in a store closer to home. Can someone please help with recommendations of online locations (if there are any) to purchase them as well? Our blades are ruined and we are being overtaken by our lawn as we continue to look for a solution. Many many thanks.

2012 Hustler FasTrack SuperDuty 54" - Retailer won't tell me mower blades I can use