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Take the locking mechanisms from the 80's GM's and put them in your 76 vent window glass.
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just be sure you have a couple tools when you go out to the Junkyard to pull these:
something to remove the roll pin
a fairly good sized torqs screwdriver
or... you can do the chevyduty/lmc/jcwhitney thing, but a junkyard would be cheaper if you find a set in good shape /forums/images/graemlins/smile.gif