These are nominally for 16mm ID bars but I've just measured mine and they are actually 15mm http://www.ratcliffesofleigh.co.uk/products.php?plid=m2b0s311p1341
May also have been sold branded RSP, but I can only find the 19mm ones.
I found some metal cap style ones that will hopefully work, grey so will look ugly but whatever they are going on the Vomit Inducer Extreme 4000™
@Clockwise started
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These are nominally for 16mm ID bars but I've just measured mine and they are actually 15mm
http://www.ratcliffesofleigh.co.uk/products.php?plid=m2b0s311p1341
May also have been sold branded RSP, but I can only find the 19mm ones.