INA is the OEM for the tensioners right? Continental is the OEM for the belts I thought? When I replaced mine I went with the Conti belts since I zoomed in on the ECS pics of the BMW belts and there was "Continental" written on them.

I replaced my belts with Conti's about 5 years ago and I have the hydraulic tensioner on my X5 so I replaced that, the AC tensioner, and the idler pulley. I think I used a combo of INA and Conti parts -

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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