If you are wanting to run the gators on the Exmark, then you are wanting to mulch the clippings-Right?? If I read your post correctly, your unit is a 2009 with the ultra-cut deck!
Mulching is mulching for one thing and mulch kits are needed or you will have deck blowout in the front. My Lazer HP has a mulch kit with the sliding front baffle plate on the front of the deck that lowers by loosening 4 bolts. I am here to say that we found some gator blades locally that are not OEM parts and are great for cutting but because they are not the high lift mulching blade, the user will gets covered with grass fragments and dust. The extreme OEM blades are designed for what you are looking for.
I don't know if this helps you plight but the gator blades are out there but may not be what you want. At 17.00 a pop for me, I only purchased one set of gator's and threw them away after that. Wasn't worth getting covered with dust and grass on a mower that mulches. IF you are side discharging, then why are you wanting the gator's for??