I've been using Halfords Extreme bulbs in the Defender for a while now and had them in the Astra before I did the Xenon conversion... for the price they are really impressive
I tried Osram Nightbreakers... and even though they were alot more expensive they didn't seem any better - so went back to the Halfords ones again lol
You need H7 for the ZS, H7R is only used for HIDs as the bulb is a bit shorter and apparently it gives a more "legal" beam pattern in the MK1 ZS
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