Obviously these are not perfect replacements but if you want something cheap that has reasonable appearance and that you won't be afraid to ride with you can try these:
http://www.amazon.com/gp/product/B00...ef=oss_product
The large ones (10mm) need to have the edges filed/sanded just a bit to fit. And you can get a variety of colors. Like I said not perfect but a very cheap replacement you won't be afraid to ride with.
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