Hydroboost power steering pump cant find replacement

[414NeckPlug]

I just picked up a 1980 c30 with the 454, it is leaking power steering fluid at the pump at the steering box and possibly spraying some out form the hydro boost block. To fix it I wanted to replace the pump and the steering box however I cant find anything for sale that has the same routing as my trucks current setup. It has an external reservoir that feeds the side of the power steering pump, from the other side of the pump a line runs directly to the steering box, from the back of the pump two lines run to the hydro boost block mounted on the firewall. Is this some kind of uncommon system that I will not be able to find parts for if so what should I replace it with.

If anyone knows If I can get a pump to replace this or a anything please let me know
I annotated the line routing with colors to make it easier to follow

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[414NeckPlug]

update did some more digging from visual assessment it appears to me that:
TERREPOWER 7312226
LARES 2593
Cardone 20-8714

these appear to be the same as the current pump.