hey thump, got the OKO 28mm flatslide as you suggested. The breather end is quite larger than the original. Its some 48mm. The original air breather hose to the air filter just wont fit. It did come with the 48mm pod however as we previously discussed its was too tight. Again, im running with your recco on plaicing the pod filter withing the original air box however im facing an issue with attaching a air hose from the carby to the filter. Any suggestions on how you managed that? Cheers.