Why is 8 and 9 not for sale?

These parts are not sold as pre-cut fuel lengths unfortunately. They are sold in longer lengths, designed to be cut down. Please see the following links: Part '8' - https://www.lsengineers.co.uk/hose-3-1x5-7-mm-x-1-m-r5-for-stihl-br350-br430-part-no-0000-937-5004.html Part '9' - lsengineers.co.uk/fuel-hose-per-metre-for-stihl-ts410-ts420.html