I am swapping everything 5 lug from a 1972 GMC frame over to a 1969 C10 frame which is all 6 lug. The 1972 Axle housing is wide, and the 1969 axle housing is narrow just like your 1967. So I bought conversion axles from Moser that are the correct shorter length for the 1969 housing, but have 5 lugs like I want to convert over to the 5 lug setup on the truck.
http://www.summitracing.com/parts/msr-a3065gmt5
Gary