Might want to check with boat shops, particularly ones that work on sailboat rigging. I'm in the Sacramento area as well, but it's been years since I owned a sailboat, so I'm no longer up on who's doing that work in this area. With all the boats in town & in the delta, there's got to be a least one rigging shop somewhere nearby.
I you can find a shop and take in the broken cable, they should be able to duplicate it for you.
2307C / 2002 GMC Sierra 1500 ext cab (BellTech lowering kit, AirLift load-lifter air bags on rear axle, on-board compressor)