I presume you are talking about the four rivets up the back side of the chrome frame that secures the rubber seal?
When I did this, I opened the vent to 90 degrees out of the frame and used a old pair of pincer-style nail pullers to smash the rivets flat. I used a large pop rivet to replace the old vent pivot rivet, so I only had to deal with the 4 rivets for the new rubber seal.
Mine are oriented with the flat part on the rubber side and the flared part in the roll-up part of the window channel.
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1967 P220 Amazon, 1972 145S, 1973 1800ES, 1977 245 DL, 1983 245 GL, 1986 745 GLE, 1990 745 GL, 1995 945....
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