I have 75 6 lug axles on my 69 gmc and want to change from the rally 15 inchers to a set of later model factory 16's for street driving. Already have some free 16" tires. Will keep 15" mud treads for just that...muddin. Will the late 80 and later 4x4 16's with 6 holes fit the older axles bolt pattern and center hole? My junk yard that has some is a long ways off and he doesn't know squat about what fits on this subject. My bolt pattern is the same as my old 86 k-5 blazer that had 15"ers. What is the width on these two types of rims also...thanks. Mike