Welcome to Krags. However, things are not exactly as you perceive them. The reason you cannot use 1896-cut wood on an 1899 action has nothing to do with the faintly derogatory use of the word "purist" (a little cheeky for a newbie, I think) but rather the fact that the inletting is different! So, your "option" does not exist.

There are four basic Krag carbine stocks (note lengths):

(1) 1896 (30")
(2) 1898 (30")
(3) 1899 (32") cut for 1896 action - replacements only
(4) 1899 (32")

Your ONLY choice - which I'm sure can ALSO be had in repro, if you wish - is number (4).

As to sights, the 1901C would be the most likely choice for a generic 1899, as they are the one most often found thereon, and are less expensive than the other choices. Each Krag sight has its' own unique matching handguard. The "correct" handguard for your gun would be the one with sight-protector "hump", adopted in 1902. You apparently have the correct band - the one with ears ONLY fits stocks (1) and (2). As to where to find a sight, use the classifieds here, or check out the parts suppliers listed at   (You need to Login.

Good luck.