The reason they haven't made the Hyd MSC for the 2520 is JD has no boot for the MMM's. My dealer ordered me a metal boot for my 62D MMM on my 2320, everything works great. The other problem you will encounter is that JD won't be coming out with 3PH/mower lift arm lock kit till Sep/Oct of 06. I used a set of lift arm locks from my 4115, they work okay.