I am running the Lincoln rears, but do not have the e-brake hooked up, nor did I get the Lincoln e-brake cables with all the parts I bought. Aren't the extended lines from WH for drum brakes? Do your calipers have the E-brake actuating levers on them? If I were you, I would see if a local parts store has a Lincoln e-brake cable in stock to see what the fitting on the caliper end looks like. If it is significantly different than the ones from WH. I have no idea what the solution would be.
On the calipers themselves, there is a cam that the cables attach to. I believe the cams are removable, so you may not even have the parts you need to hook the cables to.