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Sounds like the vibration follows the vehicle speed and not the engine speed...?
If so, your engine should be fine. Everything after the engine (clutch, transmission, drive shaft, etc..) could be the reason. Seems like some imbalance somewhere is coincident with the resonance. Since the OEM wheels are smooth as butter, maybe it's your aftermarket wheels/tires/spacers.
Anyway, unless the aftermarket parts are from a top tier OEM supplier with high Quality Control standards, ALWAYS stick with OEM.
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