There's a company called
Tom's differentials that is making axles for them, but so far only for the '55-'59 version. It requires a change over of the side gears to the later 30 spline gears from a 12 bolt, and I beleive a different cross shaft to eliminate the center block. Not sure if one could use those axles to install a locking diff or not (like an E-Z Locker), though.
