I would suspect that the 4100 and 4115 would have the same mounting. I am pretty sure that the 4200 is different. Maybe the seller has one of each?
At that price, it should include the tilt/angle mount and the front hitch.
Besides the tilt/angle quick-tatch mount, you need the front hitch that hooks on where the front of the MMM normally connects.
If you don't already have the spot where the MMM and front hitch connect, you will also need the front hitch mount. If you have the front grill gaurd that comes with the FEL, you should already have the front hitch mount as well.
If you also get the mid-to-front drive shaft and bearing kit, you will be halfway to having everything you need to also put on a front blower as well.
I have the 54" blade on my 4100 and I wish it was wider for moving snow. Thinking about adding some side wings to it.
- Rick