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If you have a Demon Tweeks Performance Direct catalogue, they are on page 112, near the top of the page. Part no. ABCR-310/13109 and are in clear/smoke £15.99 per pair. Phone 01978 663 057 to order some and you will get them the next day.
Failing that I think others here have bought some at Halfords. (See comments on "How easy is it to fit new side repeaters?").