I'm looking for a replacement window rubber for my sliding door, as it's started letting a few drips in (and ruined my new plywood interior panel

It's an '84 Westy (LHD - R/H sliding door) - original factory windows
Without groove for the Chrome trim - just a plain seal
I've looked on Brickwerks and CVC. Brickwerks only sell a "late" one (what's the difference?), and I couldn't find them on CVC.
Tried Chris' VW Emporium. There's one on there for sliding door glass, but says left/nearside... Is there a difference!?
Many thanks
