Someone like Venhill will definitely be able to help, but only as ‘custom’ cables, it’s highly unlikely they’ll have any off the shelf spec for your mates application, so he is still gonna have to provide them with detailed info inc:
Length of the outer (from lever to abutment, which would normally be on a rearward extension of the torque arm).
Length of the inner.
Nipple type / size.
Ferrule design.
Type and size of any female threads at either end.