I just had the HiViz sight put into my XD9 Tactical by my local smith. It works fine with the stock rear, though it is not as bright as some other brands.
Dawson also makes a fiber front that works with the stock rear.
The original owner of my pistol installed one of the original HiViz sights. He cut the stock front out with a dremel, gouging theend slide in the process. After about 5000 rounds in my posession, not including however many he put down the pipe, that sight broke in half.
The new HiViz sights have a solid cast fiber in resin, and appear to be much more sturdy. I was hesitant to buy the same thing, but the new one looks much stronger, and I doubt it will happen again.
I know I am late to this party, but if the OP is anything like me and procrastination rules, maybe this will still help