The front cable should be the same, and all of the wagons have the same rear cables. The sedans with the large drums should be the same as the wagons.
If the cable is frayed, you should change it. Since it is just a cable, I would not worry about the Dorman brand, they should be OK.
The existing cable could be binding where they enter the brake backing plate. There are sheaths over the cables from about the rear axle to the backing plates. Corrosion in the sheaths could be your issue. There is a rust remover that was advertised on Engine Power recently, and it may be something that you could soak your rear cables in to get rid of any rust, then lubricate them well.