When I bought my XD 40 last week, the guy said that he has never seen, sold, or been able to order any XD that had the tritium sights, or anything other than the basic sights. He isn't sure if it is a California thing, or that they are just rare.
He then said that he has spoken to customers that have purchased them as aftermarket accessories, but he and the customers have been unable to find anyone who can properly install them--something about press configuration and angles or something that didn't make any sense to me.
Finally, he said something about SA not being willing to install different sights. Which really puzzles me.
It seemed extremely strange, so I don't know if it is BS or not, but if you are looking to replace your sights, might want to ask around and find someone that has done it before you bother buying them.
Looks like someone has manufactured a home made tool, but doesn't look like something I would want to use.
XD Sight Pusher
And a discussion of sight replacement:
aftermarket sights
Might also want to check out articles like this on how to configure night sights:
Low Light Essentials #6 - Gear - Handgun Sights and Lasers