SMM3564W Ferret Replacement Wheel Set
For the Airfix kit, these are straight-forward replacements for the plastic kit wheels.
The brake drums fit the kit axles, followed by the wheel and hub. Note that the wheels often have positive camber (angle in slightly towards the bottom).
The spare wheel hull carrier (which is the correct length, unlike the kit) can be displayed with the spare wheel removed and studs in place. With the wheel mounted, the studs are not needed.
Available from: https://www.scorpion-miniature-models.co.uk