DD, for the federal emmissions group, get the yellow one. It is #63 on the diagram. I did post the part number in another thread, and did confirm that the part numbers posted by Sam earlier in this tread are the correct ones. I took the part numbers and had the parts guys look them up. The yellow restrictor is 2mm ID. You have to order it from MB. I was told it was $3.50 for it. The dealer did not make me pre pay it, and when I went to pick it up, they told me "No Charge", as it showed up as being pre paid. Now if I could have that happen for all the door seals... 
Also, at the dealer, the orifice is now called a nozzle.
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RRGrassi
70's Southern Pacific #5608 Fairmont A-4 MOW car
13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.
99 W210 E300 Turbo Diesel, chipped, DPF/Converter Delete. Still needs EGR Delete, 232K
90 Dodge D250 5.9 Cummins/5 speed. 400K
Gone and still missed...1982 w123 300D, 1991 w124 300D
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