I tried to buy grips from Tredz and there send the wrong ones, this can happened, but: Instead of accepting there mistake there would only send me the right part after there received the old part first, what meant another week delay. So there send me on a 20 miles round trip to a collect+ store to send it back. After complaining that I will be without grips and money for over a week there offered me a "generous" £5 discount for a upgrade grip, after I paid over £10 to send the wrong grips back. A week later there told me the grips would be ready to ship and send me an invoice without the discount! It's a swizz!