JW -- Replacement rods are hard to come by, but at least one vendor offers a rebuild service -- you them your rods and they will get them reconditioned and rebabbited to your specs. The one price I saw was $160 per rod.
Boy- - - -Jesse James had to use a GUN to rob people! With the correct lead/tin/antimony alloy, that bullet casting pot we tinkered with a while back can be used to re-pour a set of Babbit rods- - - -for about 15 bucks each. All it takes is a few decades of experience, and some pretty sophisticated molds to get it configured into the right shape!
Jerry