Like I said in my other posts, try http://www.shermanparts.com/. Looks like rocker panels for your car are $45.99 there. I have purchased body panels for my W114 from them in the past and had nothing but good experiences.

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280