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just go get some cheap imported Allen wrench set and you'll find the right size. I'm with Mooser, .050 seems to me as the correct size. I can check this tomorrow but you'll probably have them off by then.
I took one of my cheap allen wrenches that was slightly too big and dressed the sides with a needle file until it fit. Then I taped a label on it "Corvette vent ****" and that is the only use for it now.
Hope this helps, I thought it was an odd size allen wrench, I likely filed down a 1/16" allen wrench if the correct wrench size is .050", good to know.