Have you got a friend who owns a Savage?
There are downloadable manuals for the savage at www.hpiracing.com, but i doubt they would have the actual sizes of the components, most of the time they just give part numbers.
If you know of a place that stocks LOTS of Savage parts then it might be worth taking a part and trying to match it up with a Similar savage part. It could take a while to go through everything, and you may discover that none of the parts are interchangeable, but i think it is the only way.