Streamline don't list any 888 parts - although they might be able to if you ask directly.
QB carbon's website has been suspended and all the parts now seem to be available through a distributor called Speedycom on
http://www.speedycom.co.uk/shop/home.php I thought for one moment that the prices had gone up dramatically, but then realised that the QB site used to quote prices excluding VAT, the Speedycom site seems to be including VAT