Tom covered the coma corrector situation pretty well.
However, it should be noted that most (all?) Baader products use a rather "unusual" M48 threading which probably won't mate very well with any other products. In fact, I started a thread about this problem a few years ago here on CN that has additional information on connecting the Baader MPCC coma corrector to my TPO 6" Newtonian. Basically, I wanted to move the coma corrector further down into the 2" focuser so that the end of the focuser drawtube didn't extend out into the path of the main mirror. I was eventually able to do that (as explained in the below link), but it required finding an adapter that would fit to the Baader M48 threads which wasn't that easy to do.
And here, in that same thread, was my final solution: