M111 head replacement questions
 

I'm replacing the head gasket on my 99 W202 M111 and have some questions I can't find answers to.

Where can I find the cam sprocket bolts? The WIS says to replace them, but I can't find them anywhere online.

Are the camshaft bearing bolts reuseable? I didn't see a reference to replacing them in the WIS.

Are the head to timing cover bolts reuseable? I don't imagine they're under much torque...

They are one time usage bolts, most likely dealer only.

Cam bearing bolts are re-usable.

Great, thanks. Dealer has three in stock. Heading to pick them up now.

Do you think I should replace the chain while I'm here? I'm replacing the tensioner. The car has 130+k miles. I have new guides, but the old ones show very little wear. Barely a ridge to catch a nail on. I'd rather not pull the timing case cover if I don't have to.

The m111s are virtually indestructible, by the standards of the day. My understanding is it's a double-chain style, and is lifetime (400, 500k miles? who knows). The 4cyl creates very little stretch. My 97 had no notable chain wear or internal issues through 180k, when sold. Of note, the head gasket was replaced under Starmark warranty around 95k/9 years.