Don't know if this will help, but I did all the windows in my 54....used Classic American parts replacement vent windows and setting tape. They said to use the tape as it came off the roll....the rubber on the glass, fabric towards the frame. Cut off ample tape, SOAK IT for 10 minutes in motor oil, using the glass like a shoehorn, press in the glass to seat it.
A couple things I discovered on my own...the CAP glass was a bit thinner than the original (I got the tinted stuff)...you're best to have the wing window mounted in the frame so you can close it up and make sure the back vertical edge fits properly against the vertical seal in the frame. I moved it around until the glass was properly positioned and locked the latch down....next day the glass was tight. Trimmed the excess tape and I was good to go.
My replacement glass is .235 thick and the setting tape .045 thick. You didn't mention if you were soaking the tape but IT IS A MUST. Makes a big mess but my windows are secure and fit properly. Hope this is some help!
Dave
