When buying a cable type bellhousing, make sure you buy it complete with clutch fork and nylon bush for the cable. These parts are harder to find than the bellhousing itself. If you don't find one complete with clutch fork, you can use VN VP VR Com v6 fork, its the same but has a weight on it that can be (carefully) cut off. It shouldn't be hard to make the nylon bush, but a lot of cars with this system seem to get by without it, not sure how much difference it makes to the operation.

A bare bellhousing should be a lot cheaper to buy than a complete one.

cheers
Max