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Probably. There are 3 different arb sizes for the Sierra, 24, 26 and 28 mm. The Cosworth uses only the 28 mm, but perhaps you have sent one of the other bushes, as the clamps on those models can be smaller too.
Cheers guys, haven't had a chance to phone them yet until tuesday, they go over the arg but don't fit in my clamps, on the box says for all cosworth 28mm
ARB bushes
