OK, sitting here with the resistor end in hand. There are no markings on it other than a "6" molded in the lip at the wire end. With the ohmmeter set at 20K, I get a resistance reading of 5.24, I get no reading at lower settings (at higher setting I get 200k - 5.2, 2000k - 005).
I'll see if Franz, my local MB tech has a good one off the parts car for comparison.
73 280 SEL 4.5