nice wagon, i have the same car that's under construction. I'm runnung an 18rg with a 5-speed. I need a rear hatch glass molding as well, as mine is rotted out pretty badly.
I spend about $250. on after market special order stuff that did not work and could not return. Don't make the same mistake. Took mine to Auto glass shop and they pretty much glued the rear and side glass. They had to paint about an inch all around the glass for the adhesive to take (silicone). For the rear, to dress up the work they used a Jeep molding.
Check out rear spares out of Australia (http://www.rarespares.net.au
) for all your other weather stripping.
Where did you get the 18rg?