Source for lumber
If you really want to be satisfied with the result, replace the wood with wood a suggested earlier. If it is white pine, here is a source of recycled wood, you can get it in quqrtesawn clear boards, which should match your exisitnig floors. They have excellent pictures.When I replaced boards or plugged holes in the floors of our old home, I was able to play with stains to get a good patina match and ended up with no observable differences. I was lucky that they had saved cut-offs from when the house was built in 1925, so duplication of the wood was no problem.http://www.longleaflumber.com/whitepineskipped.cfm