The 123's that I've helped out on the Greasecar installs had them mounted to the drivers side wheel well. Metal screws that hold on a clamp mount that surrounds the filter. Don't those come with the filter head and a different size filter? Then the copper tube that carries the antifreeze runs around the filter. I'm pretty sure that's how it was done. I was always the one who worked on the tank installation in the trunk, but it seems to me the solenoids and the filter were mounted just ahead of the firewall and fuse box on the fender wall.

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"Knowing is not enough, we must apply.
Willing is not enough, we must do." Goethe

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1951 Chevy 3100

2003 Indian Chief Roadmaster

1983 GMC 1 ton Dually

1982 Chevy 1 ton Dually, service body (sold)

'90 GMC Suburban 6.2 "SS Veg-Burban"
(single tank WVO\diesel conversion) SOLD

'81 300D ~ Mama's car...my job (now my car)(but still my job) SOLD

'83 300sd ~ rescue car SOLD

2005 Ford Taurus (Mama's new car)(NOT my job!)