Yes, you may also use the 3.875" billet rod with bearing inserts available from ARC (and other aftermarket providers,) as it is a direct replacement (ie no mods necessary.)
Most kart shops and engine builders on here will have an abundance of new Briggs rods left over in inventory.
We have closeout pricing on them in our shop as well.
We also have used stock length billet rod take-outs that would work well for your application.