Don, where did you find a 27mm? I can't even find one from snap-on.... the biggest I can find on their site is 26mm. I'm sure I have a standard size that will "fit" but I would rather have the real deal.

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1985 300D Turbo ~225k
2000 F350 (Powerstroke) 4X4, SWB, CC, SRW, 6spd ~148k
1999 International 4900, DT466e (250hp/660 ft/lbs), Allison MD3060 ~73k