There is only one option for the front. I am not entirely sure on the rear seal. Mine is a different seal that is round. I would think pointing the flap to towards the front so it doesn't interfere with the latches?
I'm replacing all three of mine so have the old ones to guide me. The flanges angle back on the both the one at the radiator and the one at the firewall. There are two short "gaskets" (about 5 inches) that go under the 175 where it turns the corner at either side of the car. I'll try to add photos, but this is my first post so who knows.
Also, the 175 on my car was glued in. Any opinion on whether the replacement
should be glued and if so with what adhesive. 3M Weatherstrip Adhesive works a bit like contact cement - one touch and it's done; that'd be hard to control with that long rubber piece.
(I said it was my first try, sorry for the mess.)