Yep, my bus came from hotter climes where heating was considered supurflous and no one since has put it back! I've found most bits but I'm stll missing the 2 Red and 1 Blue leavers. Original ones prefered as I've seen comments that the plastic replica ones are poor quality.
I have a some - the two reds are brand new JK replica ones, and the blue is an original that has been mended but it works fine and you can't see the mend once fitted. I didn't use the JK ones as they were too bendy for my old stuff flap boxes and so got hold of some stiffer original red ones. You can willingly have these for free. I was given the ones I'm now using for free by KeithH and so am looking to passing on his kindness. Let me know if you want them. Nick...
Parts emporium has them (a little pricey though) near the bottom of the page: http://www.partsemporium.co.uk/type 2 vw camper bay window parts spares.htm