JLM
The reproduction suppliers ignore the big truck market. If a part is not used on 1/2 ton trucks, you are often out in the cold. If the cables are not degraded from rust, I would suggest that you soak them in the penetrant concoction of your choice and work them free. You may have to be patient, but most parts come loose eventually. Try your best to resist the temptation to hurry and break the part you are fixing...
Paul