One last note on this, the October 2011 issue of Custom Classic Trucks magazine has an article on replacing door weatherstrip/rubber in the 67 to 72 Chevys. At some point I believe they will publish the article on line.

I hope someone finds this helpful.

40 chevy 1.5 ton, 50 chevy 3/4 ton, 67 chevy stepside 1/2 ton, 67 C50, 68 C50, 73 chevy 4x4 3/4 ton, 2004 Silverado 1/2 ton , 2005 HD 3/4 4x4 Duramax (don't even get me started about my Oldsmobiles!)