Hey Kenny, I tried several different muffler shops in my area and no one would do this for me.
If your's works for length and no leaks, maybe consider going back and asking if they'll make a few more and sell them to us here on SS.com (for those of us who have close-minded muffler shops all over the place
)
Currently, I have my Dyna mounted without any adapter; lotsa folks on here have done it that way. I used a couple tin can crush washers and I think I may just have the tiniest of leaks. But, If an adapter would take a little stress off the joints and extend the mount point back a little so I could use 2 bolts, I would consider revising my setup.