After the final fitting of the coolant reservoir, I welded the mounts into the strut tower.
The next step was to plumb the coolant inlet through the firewall.
I made this aluminum o-ringed plug on my lathe. I need to make a large enough hole to pass the flare fitting through the firewall, so I can't use a regular rubber grommet.
.780" hole drilled, which should be large enough to clear the 11/16" hex on the flare nut.
There is an O-ring and retaining ring on the inside to hold everything in place.
Back to bondo! I laid a coat of Evercoat Tiger Hair, I should be spreading regular filler this weekend.