Hi Russ, you are correct. It slides under the window seal, which is a bit of a pain as you have to come in under quite an angle to get the cowl over the wiper bolts.. 4 hands definitely make it easier and what I usually do is put a piece of rope under the window seal, which at the ends you make sure to put on top of the cowl when you wiggle it under the seal, and with a little pressure on the cowl, you gently pull the rope under a 90 degree angle, pulling the rubber over the cowl so it sinks in place..
Hope it makes sense, but it's to way to go..
JC de Koeijer
Giulia street rod, '65 Giulia 1600Ti, 74 Spider Veloce, '05 GT.