Ken,

For the most part I have found these screws are all standard threads, materials and lengths. I can find them in stock at my local hardware store. I bent a hex head cap screw that holds the camshaft sprocket to the camshaft on my 1986 190E 2.3-16 while adjusting valves. I was sure I was going to be stuck for a week while I ordered a new screw, but took a ride to the local hardware store and found the exact fastener, material, thread, and length. Since then I have found a number of other ones, exact duplicates in terms of lengths and threads and material, so I am convinced MB does not use odd lengths for anything. Jim

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Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)