Well of course, Walter is correct about SS versus chrome and perhaps we should have made that clear. However, that is a nit that really didn't need picking. If one goes out to find the blades, I don't know of a source that will offer "Chrome" blades versus SS blades. The correct Bosch blades, if they can be found, are SS. Much more important, in my opinion, is the physical size of the blades. The early "bright" blades are substantially larger in physical size. I haven't seen them anywhere in the past 20 years or more, so if you have them, preserve them. I am still able to order the refills, but at substantial cost.
Vince Canepa
1967 250SL
113.043-10-001543
568H Signal Red
116 Caviar MB-Tex