custom length steel rods supplier (no replies)

Hi I'm looking for some replacement steel rods for my Ultimaker, they need to be 6mm diameter, pretty smooth, straight, and custom lengths, I guess in terms of grade, SUS304 would do? Does anybody know a supplier that does this and ships internationally? All I've found online so far are suppliers that either don't do custom lengths, don't do rods thin enough or don't ship internationally. I live in Japan but will be in the UK for 3 weeks next month.

Thanks,
J