'91 GMC G3500 Power Steering Switch

[travellingforgood]

Hi,

As you see in the title, I’m a bit stuck trying to find a part for my mini skoolie. I have a 1991 GMC Vandura G3500 8cyl 5.7L with hydroboost.

We need to replace the switch in the power steering return line, but all the online searches only pull up the part on the right and I need the part on the left (see circled in pic #1). The part is leaking at the pump (see arrow in pic #2).

Anybody know what this part is called and/or where we can get it? Any help is appreciated.

Cheers