2024 Cub Cadet Ultima ZTXS5 54, 2007 John Deere 2520, 1989 John Deere 185, 1960 Panzer T70B
It's not a rotary cutter, but here's a diagram of the adapter they use for the Frontier rear finish mowers. Basically it's two brackets that go from the bottom pins up to the top pin to hold it down to the correct height.
Something like this could probably be fabricated pretty easy.
Also here's a pic of an adapter I made to deal with fit problems for a landscape rake.
JD 5203, JD 3720, JD 4110, JD 445, IH 1586, IH 886, IH 404......
When you build whatever you make to attach your cutter, just make sure you keep it as close as you can to the imatch. The farther back you go, the more you will offset your tractor with the weight. It wont take much to make the front of a 2305 light.
Shown is a bracket that my dealer made to adapt my RFM to my I-match. I got another and added it to an old John Deere 4' brush hog. I added the u shaped collar and the bracket keeps it from extending. I have several other pictures that show the measurements better. I don't have anything of the brush hog with the bracket in place.