Gary, if you're rebuilding the engine then it's cheap insurance to change the timing chain, tensioner and guides. Perhaps also the springs. Sprocket wear to me is an eyeball thing. If you know what the new sprocket is supposed to look like.... ....and your eyes may be different than mine.

Try Phil at this site for the front engine stop. Any parts guy is going to have to look at the microfiche then cross over to the computer for these old parts, by the way. Some (not Phil) are lazy. That CD I referenced earlier (also from Phil) has front engine stop installation and adjustment instructions, as well as great engine overhaul stuff. Send me a Private Message with your e-mail address and I can send you an Excel file I built which is a table of contents for the CD.

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daBenz - 1970 220D