Just an update, after getting the frame off I spent a solid 15 minutes partially cleaning out one bolt enough to see it is indeed a m10 XZN head under all that grit. I couldn't get it to turn and am not going to push it until I get a better XZN bit. Mine has the end chipped off so it doesn't get a full purchase in there, not going to risk stripping it. When I get a bit I'll use the air wrench. Between this and getting the axle nuts off, I have quite a bit of labor ahead of me.

Thanks for the help!

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1987 300D, arctic white/palomino--314,000 miles
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