The 58-02 aka 58-93R-02 or 58-93-02 is a tong developed by Foster to provide a less powerful but faster alternitive to the 58-93R. Many of the parts are interchangable with the 58-93R. It uses a different Final drive, final drive bearing and low clutch gear.
Later a company developed and improved the 58-02 by moving the shifting handle and changing to final drive to the standard 58-93R Bearing.
The later models of the 58-93-02 are nearly identical to the 58-93R. The 58-93-02 use a 60 double chain.