I have to replace my feeder chain in my 08 9770 sts. It has the regular steel slat chain in it now. The new chain the parts girl gave me has the cast slats like my 09 9770 with the 4x4 feeder house and she says this is the updated chain. I was always told not to run this style chain with the cast slats in the non 4x4 feeder house. Is it okay to use this style chain in the non 4x4 feeder house now or did my dealer make a mistake?