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Problem now sorted hopefully... Before I go into details, I would like to quote the old saying 'buy cheap, buy twice, buy thrice' as all brake pads are not equal & all brake pads do not fit as properly as OEM pads....especially if they are produced in China for the EU. My problem was brake knock/rattle over bumpy roads at low speed & it was indeed the pads. It wasn't the height of the pads that was the problem (183.4 mm), it was the width of the pad ears. The pad ears on cheap pads are not wide enough, hence they rock back & forth, which causes a clunk/rattle on rough ground which goes away when you apply the brakes. I bought some NAPA 'proformer' pads & they have ears that are (and I've measured them with a micrometer) 0.9mm wider, which pushes into the caliper clips alot tighter, thus stopping them rocking back & forth and preventing the brake pad from rattling....at last I'm a happy 300C driver