The 228 I just got yesterday has a HiVis front sight, but the rear sights are the factory white dots.  Now that I have seen these HiVis sights, I realize that they are the cat's ass and everyone should have them.  Unfortunately, I can't seem to find a matching rear sight for my gun.  Who else makes these kind of sights that would have both a front and a rear sight?

You probably won't find one either.  Seems to be just for the front sight.  :)

http://www.hivizsights.com/content/category/category_29.asp

" The popularity of our durable overmolded pistol sights has led to the introduction of the new CZ 75 front sight, the Sig Sauer front sight (which also fits the popular Springfield XD model pistols) and a new color of Glock front sight (crimson). The CZ 75 and Sig Sauer/Springfield XD sights have a new twist with their square profile that allows more precise alignment with factory rear sights."