Can anyone shed light on parking brake cables.. ?

For the last couple of years I have tried to understand what type of cables I need for my parking brake system.

I know there are three basic sections. The front, the middle and rear that connects to the drums.

The cables are sold in various lengths and I have measured mine and not found a common cable.

For a late A body that has a wheelbase of 108 inches, that is running an 8 3/4 rear end, what model middle and rear parking brake cable do I need to order ? And what are their lengths ?

I did do a search for this topic and didn't find any applicable posts..

Thanks
Ian.