I recently acquired a 1898 krag carbine, partially sporterized.  Good news is that it still has its original front sight, and no extra holes were drilled anywhere- with the original rear sight holes intact and apparently in good condition. 
I am hoping someone could tell me what rear sight belongs on this rifle?
Serial # is 292xxx (sorry Im at work and dont remember the last three numbers)
So from a little internet research it appears to be a 1898 carbine made in 1901. 
Any help would be appreciated.