Motorcycle and Scooter appreciation

The most important dimension of the clutch cable is the amount of bare cable, as long as it's within the adjustment capacity of the handlebar you'll get away with it, is there any way you can measure the old cable and housing and see what dimensions you need?

The cable you've linked to is a throttle cable.

Try searching on Venhill.co.uk for product code H01-3-016. Looks like the cable for your bike.