I am performing a head gasket replacement on my '86 300E, and I stripped out the camshaft bolt while using the 6mm allen wrench. My plan is to reverse tap the bolt to get it out, but my question is what to replace it with? I don't know the part # of that bolt and can't seem to find it at the usual online stores...anyone know what the part # for this bolt is? (I've attached a pic showing which bolt I'm referring to)

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Not sure, but since you have an 86, replace the rotor if you have not. The original rotor had an update to a different material as it expands and gets stuck in the head. Trust me...I found out the hard way....

Updated Rotor # 103 158 0840
Screw # 000912008219 (M8x20)
Washer if needed # 103 158 0076

This type of thing is probably a dealer item. Will cost you ~$3.

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k

Well, you have to get it out, so when you do take it to a bolt/screw store and match it as close as you can. Or visit a wrecking yard. It's not a high-stressed item, so just about anything with the same thread pitch/size/length should be fine.
The book shows an early and late version, M8 by 29mm - 21 Nm torque; and M7 by 26mm, 16Nm torque. If your rotor holder that it screws into is aluminum, it's the 1st version; if steel, it's the 2nd version. But no thread pitch is given in the book - so gotta get it out and check.

DG

believe it or not home depot sells that screw. once you get it off take it there and match it up.

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Eugene

10 E63 AMG
93 300te 4matic
07 BMW X3
14 Ford F-150 Fx2

We had this problem.
Get a good quality Torx bit and hammer it in. Use the "sharp tap" method to crack it free rather than just apply rising pressure...

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2009 Mercedes ML320 Bluetec

What typically leads to this problem is tightening the bolts on one cap fully rather than tightening each bolt on all caps a little at a time in order to share the load amongst ALL the bolts. I would think that you stripped the hole, not the bolt. Repair it with a helicoil and then GRADUALLY tighten all bolts a little at a time until they are all cinched down.