I posted this on the exmark dealer thread, but was just checking to see if anyone else had experience with this issue. I went in to get blades for my 60" Lazer z with the triton deck. The dealer had the old black blades with the 5/8 bolt hole and the new red blades with the 15/16 bolt hole. Some of the red blades had the recessed bolt hole and some where flat. They said either one would work. Can I run the flat blades or do I need the recessed ones? What deck are the flat blades with the 15/16 hole go to?