SORRY TO BRING THIS BACK UP TO THE TOP, JUST DUG THESE OUT OF STORAGE TO SHOOT'EM:
I FOUND THESE IN AN ABANDONED GAS STATION LAST PUMPING GAS IN THE MID-80'S AS METRO. IN THE MID 90'S BEFORE THE BUILDING WAS TORN DOWN, I WENT THRU THE PLACE AND A SMALL BUILDING OUT BACK AND NETTED MYSELF THESE GUIDES AND SEVERAL 5 QUART CANS AMONG OTHER STUFF. I ALWAYS SAID...."IF IT'S FREE - IT'S FOR ME - GIVE ME 3!"
DOC @ THE AMERICAN GARAGES.