Alfred, thank you for the information, and Hauser for confiming.
Those washers in the photo I posted were certainly not from a W113 specific site or car, but merely to illustrate "finishing washers" designed to take an oval head screw for the benefit of those that don't have anything like it on their car! I did not indicate that they would be 100% correct but they CERTAINLY are better than what a lot of cars have--which is nothing at all...and nothing at all with an oval head screw = damage to the [very expensive] grill surround parts. Alternative, you'll see truss head, flat head or other headed screws with
no washers at all. A finishing washer as shown, in [nickel or chromed] brass or stainless, is readily available in many places and provides a
measure of originality without breaking the bank or jumping through hoops or international shipping to deal with. We all have to compromise somewhere--remember there simply are NO original tires available anymore.
Alfred, when you point us to websites like you did understand they are in German, a language only a few of us W113 owners are familiar with. The only difference between the finishing washers they illustrate is that they have flat side as opposed to angled. At a cost of 17 Euros for 8 pieces (that's about $24!) that's pretty expensive...beyond expensive and into the realm of outrageous. There are many, many suppliers of all kinds of hardware in SAE, DIN in all materials, and a good number of these are in the USA. With a little sleuthing the astute could probably find finishing washers with straight sides in nickel plated brass--if they are so inclined.
Personally, I'll also offer the following--the
specific washer I showed a photo of, as well as the photo of the "correct" washer from that eBay/German website, are both less than optimal choices from a technical standpoint in washer selection! A proper choice would have been what is called a flange finishing washer, which is less likely to cut into or damage the material being fastened.
The true value of any one of these washers from any number of fastener manufactuers is about $0.02 each. Stainless, brass, chrome, zinc--two cents.
But, all that being said--thanks for the links. I'm itching to check what kind of washers I have...and to see what I have to do about that in the spring! My guess is I have closer to what I showed than what Hauser has or Alfred indicated--only because I know that the restorer simply used locally available fasteners, and it would not be the first time I found wrong ones in place.
Oh, BTW this just in from our friend Dave Gallon...the "correct" parts are available from MBUSA:
Washers: 900056 003507 list $2.50 (Dave's price $1.85)
The chrome plated oval head screws (from Mercedes, exactly as original) are: 007983 003216 list $0.90 (Dave's price $0.62)
When in doubt, check with the source...Mercedes-Benz!