I just bought a headlight relay today from Mazda to disable the day running lights, its the relay from the year where they stopped running them, the part number is GS1E67890A the cost is approx £140 including vat, the relay is fitted behind the glove box apparently secured on a bracket with a 10mm bolt, will hopefully be doing mine the weekend if it arrives in time so will let you know how it goes and if it works!