I have checked all those stores but i can not figure out if they are selling open loops belts or closed. I am still a newb in this department that's why the question. Same goes for sdp mxl closest W for belts is 6mm compared to mine which are 6.4mm.
SDP has two sections on their website, metric and imperial. The 6mm belt would be under metric, the 6.35mm (1/4") under imperial. It's the very first choice you have to make when browsing, and not very obvious.