Compared to the NAR MK7 the NAR MK7.5 comes already with more pre-wired light channels. That makes a retrofit a little bit easier. Generally there are at least 4 ways to do it. In any case you need to change the coding.
1. DIY: Modify existing connector housings, re-pin several wires and add wires between Outer and Inner lights. Add further wires between Inner-Left and Inner-Right to get fog lights running. Tools: Pin Removal and Crimp.
2. Adapter harness with Pin work: Most of the known MK7 harnesses require running wires between Outer and Inner lights, Inner-Left and Inner-Right, and plugging Pins into connector housings. In case of uninstall or misplaced pin you need a Pin Removal tool.
3. Plug and Code harness: Everything is pre-pinned. Customer needs to run pigtails from Outer to Inner and Inner to Inner and plug only connectors. Easiest install and uninstall for sale.
4. OEM+: Add and run several wires between BCM and lights through the vehicle.
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