Funny you should bring this back from the dead.
I bought the H-Fit piece with anticipation of getting the T1R but I got a little distracted... It's summer and I've resurrected my DSM and that is getting most of my attention for now.

So for now I'm only using the H-Fit extension.
Through some more research I've found out that the T1R piece has a ball with a larger diameter than stock, so the H-Fit extension needs to be bored out a little bit. No problem with a vise and a drill bit or maybe even a small grinding attachment on a dremel.
The only problem I foresee: If the H-Fit does not have enough clearance on the bottom of the T1R, it might not be possible to raise the entire assembly via washers/spacers because the plastic trim which covers it becomes the limiting factor.