assuming they're 31.8mm ('oversize'), and your bars are 25.4 or , you should be fine - It's not ideal, but as long as you get the right shim, keep them nice and tight and check that they aren't slipping around now and then all should be well.
@Alfie started
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assuming they're 31.8mm ('oversize'), and your bars are 25.4 or , you should be fine - It's not ideal, but as long as you get the right shim, keep them nice and tight and check that they aren't slipping around now and then all should be well.