Well I started putting fluid in and the belt on Sunday. Everything was going good until I look under the car and sure enough, there's a big puddle. I push it in the garage and jack it up. Turns out this line, number MB501433, was rusted through right where it runs through the rack mount on the passenger side.
I undo the sway bar and take the rack mount off that side and luckily I'm able to get a compression fitting to work. So far it's been holding...