Or if ya feeling handy, I have seen people make mudguards from PVC pipe cut to size and shape and moulded over a tyre with a heatgun then the original fittings bonded to the plastic this way you can make them whatever length you want, from what I remember they basically had a tyre inflated on a wheel then taped clear tubing across the width of the wheel, tubing is what they use for fishtanks etc that is clear, they then bought black pvc plumbers pipe from the DIY shop, cut it to length and and halved it lengthways trimming more if needed, then dunking it in a bucket of hot water, then basically forming it over the wheel, when happy with the shape using a heatgun if needed, they then bonded the fittings to it underneath then they had a custom mudguard for cheap to their specs.