A flanged vehicle-mounting sleeve is provided for use in association with a heavy duty vehicle, chassis-mountable, data bus signal wiring harness coupling. The coupling includes a receptacle having a generally circular cross-section and being adapted to be accommodated in longitudinal pass-through relation by a corresponding vehicle chassis mount including a mounting aperture for the coupling. The receptacle may also include a receptacle-flange engagable in receptacle-flange matching chassis-secured relation with a compatible receptacle-flange chassis mount adjacent the vehicle chassis mounting aperture with the receptacle supported thereby in pass-thru relation with the aperture. The optional sleeve is adapted to be slidably mounted into cooperative engagement in conjoined, axially and radially fixed relation on the receptacle with an alternative sleeve-flange engagable in flange-matching chassis-secured relation adjacent the vehicle chassis mounting aperture with the receptacle supported thereby in pass-thru relation with the aperture.
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