OE items are fine for discs tbh, drilled and slotted are available from some places but they're more prone to cracking so best to stay with plain discs.
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Pads wise, at the moment i'm using mintex pads and they have been very good.
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Camskill are a good supplier for brakes and other parts.
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Fitting is easy, jack the car, remove wheel, unbolt the caliper from the carrier and swing it out of the way.
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The pads can then be removed and the disc slid off the studs.
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Only tip on the disc fitting is to clean any rust off the hub before mounting the disc and if possible use a dial gauge to check the disc is on flat.
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