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The bracket attached to the frame rail, below the drivers door, is for the air ride pump. This spot would make filling the washer bottle nearly impossible or very difficult anyway and put it at even more risk of being cracked during off roading, in my opinion.
The pump that is attached to the firewall is for your SAI system. Removed the system on my trail rover and mounted the reservior there. Granted, your SAI system will never work again and your check engine light will come on every so many days, showing codes P1412 and P1415. Me, l didn't care about this and just blacked out the Service Engine Soon light in cluster and checked codes periodically.
Like anything, everything comes at a cost...gain a spot for the reservior...lose a spot for the stupid SAI system pump.