The D2a has 4 H7 lights. As you'd know from replacing them they are reasonably easy to get to once everything is unscrewed but there is stuff all room to do anything in the light pod.
I don't know if anyone's even put a wiring harness upgrade in a D2a. I talked with Drivesafe about this and we decided at the time (a few years ago) that it was to difficult. I think the HID kit might be more achievable provided the back of the bulb doesn't extend further back and mean you have to leave off the sealing caps as this would let dust and water in to the unit.
Mine was a base model D2a and didn't have the headlight levelling, if you have that the pod may be better or worse, I don't know. I believe HID was an option in some markets but not Australia. So there maybe something you can get from overseas that will make everything fit.
As for the blown globes... Are they only high beam or a mixture? Are you still using 55W bulbs as anything higher generates too much heat and will also shorten the life of the polycarbonate lens.and FF reflectors. Also check none of the plugs into and the pods have any corrosion of the pins and check the earth points under the bonnet are all sound.
MY15 Discovery 4 SE SDV6
Past: 97 D1 Tdi, 03 D2a Td5, 08 Kimberley Kamper, 08 Defender 110 TDCi, 99 Defender 110 300Tdi[/SIZE]
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