Just FYI, there were several posts at the YahooA100 group just recently pertaining to Vent rubbers. Here's a bit of the info.
"I just bought some from Karr rubber and installed them. "just" being in the last 4 months or so. Can't say if they fit any better or worse than others having not used others, but they seem to be water tight and whistle free, so I can't complain. The piece that goes in channel in front of the pilar is different from stock in that the stock ones were fused toa piece of metal and then riveted in. The replacements from Karr are a glue in. Seems to work fine.
I can't find the receipt or remember the cost, but not cheap. Over $200 for the pair, maybe $300, i forget."
And another source I believe.
"I'm forgetting who this was and when I ordered it, I called up Karr Rubber and the old man has the original one pice plus vertical strip in back - i.e. two piece. I ordered that pair, too. We'll see what's what and I'll take some pics.
I just hope that whomever is repoping these knows that there is a difference in the pivot point on the wing (vent) windows between early and late [67 or 68] doors.
All door and windshield rubber is available through Restoration Specialties.
i dont think they have what you want but as long as we are talking window rubber here is another source for some things - http://www.clestersauto.com/ - i bought a front window seal - mac had to work with it a little but it seems to be sealed now - oo3