You may not need to get new cables, you might just have to adjust the ones already on there. Typically when the rear brakes are replaces the parking brake needs to be adjusted.

To do this remove the center console around the parking brake handle, lift the rear end of the car (back wheels clear of the ground), put it on jack stands. On the parking brake handle you'll see a little nut that attaches to a cable. Click the parking brake a couple of clicks and while someone slowly spins the back wheel, tighten the nut untill the back tires start to drag, and eventually stop. Put it all back together and your good to go

Hope this helps you.

BTW: incase you do still need to order the cables here's a link:
Parking Brake Cable Honda 1994 Civic - AutoPartsWarehouse.com