And the Lemans flares look out of place with the 4.8 rear diffuser, look at the lines.

The Lemans flares were released for non-diffuser equipped vehicles because they follow the flow of the rear better as such.

Regardless, the flared wheel arches which either Lemans edition or models equipped with a 4.6/4.8 rear need are 150 a side. Not exactly a cheap mod by any means whether equipped with the diffuser or not.

But one would presume if you are dropping the 500 bucks on the rear diffuser equipping with the proper flares would be the right route

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2018 Ram 2500 6.7L Cummins 68RFE
19k miles -Bright White/Black - Big Horn Sport - Crew Cab Short Bed
2013 X5 35D (CEO's) - Born on 5/17/2013 -
82k miles - Alpine White/Cinnamon Brown/Premium Pkg, Sport Activity/Premium Pkg and Sound/20" Style 214/Running Boards