I just measured my bucket. The dimensions are:
OS TO OS of cutting edge (across the bottom) is 51-3/8"
OS TO OS of bucket (including the reinforcement) is 51"
IS TO IS of the bucket sides is 49-3/4"
There were two designs of the MT125 3 point hitch. The first was on the 2017 models. This design required the removal of a rear tire in order to remove / install the 3 point arms and stabilzers. It was a real PIA !
I had one of those models and after complaining to the dealer, they were able to provide an "update" kit which allows the 3 point arms / assembly to come off in about 3 minutes. All you have to do is remove one bolt, then the assembly comes right off. Goes back on in about 5 minutes. We have had many discussions on this forum (thread), just do a search. I had posted all of the LS part numbers for the kit.
I can't say for sure, but the newer models should have this new mounting system. I do know that the NH Workmaster 25s has the newer version. Another member here (mslisaj) was able to purchase just one of the components in the kit and use the rest of the original hardware to "make" the new version.
Another member (Diggin it) leaves the arms on his MT when the backhoe is one. I believe he just bungees them up out of the way.
When you get the tractor, we'll help answer any questions you might have. Make sure you post some pics!
The anticipation must be hard for sure....I still remember the wait!