Looks like pic's of the door window to top seal...correct.
Factory uses a channel the weatherstripping goes into.
Here's the channel.
and the weatherstripping gets pushed into the channel, no adhesive or fasteners used.
use a Flathead screwdriver to push the seal into the metal channel.
.
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71 blazer,350SBC,approx.375HP,700R4,factory GM TPI.Dual electric fans,33x12.5x15 ATR on stock suspension.
Petrolia,Ontario,Canada but working in Port Huron,MI.
See ALL my Blazer pic's
HERE