The 6012B is a discontinued product, no longer sold by Keysight. There is no recommended replacement for the 6012B Option 002. For standard 6012B Power Supplies, the replacement is: 6032A System Autoranging DC Power Supply

Greater one-box versatility with autoranging outputs

These single-output supplies can replace multiple units, saving rack space and reducing system cost and complexity.

Autoranging outputs provide maximum power at a variety of operating points
Overvoltage features protect DUTs quickly and automatically
Auto-parallel or auto-series connections enable greater output flexibility
Ten-turn pots for precise local control