The Williams firesights are the red fiber optic sights yes? If so then you'll love the look of them, though it's pretty much assured that they aren't as durable as the original sights. Fiber optics are what, polycarbonate, like CDs and DVDs I believe. It's durable stuff, but it isn't steel or iron, and you shouldn't expect it to last like they will.
They ARE nice and bright though, got to handle an SKS before I bought mine that had them installed, and target aquisition is VERY fast. I doubt that you'll have to worry about the durability anyway though, with the hooded front sight and all.
I'd recommend against the albanian bolt carrier. The thought of the hook style charging handle IS nice, I thought the same thing myself, but once you inspect one, you'll probably change your mind. Level of workmanship was definitely the worst of any SKS parts that I've seen. Parkerizing was patchy, matte in areas and shiny in others, the grooves didn't seem truly straight(though it did seem to cycle properly, without any binding in the receiver)
On top of the fit and finish, the thing just really isn't as practical. The HOOK itself definitely looks better(though that's the ONLY thing about the Albanian bolt carier that looks better than a standard) than the charging handle of a standard, but its slippery, it's small, there's no knurling, and just plain doesn't work as well. Cosmetics aside, with no positive grip, there's no advantage, and the overall finish of the thing lowers the cosmetic value quite a bit.
I'd say that they're fine in an Albanian rifle, but I looked at a few of them, and I'd say whatever you've got probably deserves better, i.e. what it's ALREADY got. If you plan on working the carrier over a bit, polishing it up and refinishing it, then you could probably come out with a winner. If not, caveat emptor, andremember that the Albanians didn't have much to work with...