Well I would have to say throughout the car. I do not feel any thing in the wheel.

Ok a little update,

I had the tire High speed balanced and that helped a little if at all,but I can still feel it at around 65 to 80 mph.

I cannot feel it in the steering system at all,although car does pull to right slightly and seems to catch ruts, but smooth other than that.

I would try rotating the spare in place of each of the 4 tires to see if there is any effect on the vibration. You could have a bad belt in a tire and just not know it...

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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