Power Steering Assist for 1962 D300 Dually

[Bill63]

Hello, does anyone know of a company that rebuilds the Power Steering Assist? Mine is a 1962, D300 Dually with the 225 Slant /6. The pump works however, I've removed the belt due to leaking in the Power Assist unit (the unit is behind the front drivers side wheel and has a leak in the back solenoid. Thanks in advance for any help!