The parts for the fuel door pull came in.
Turns out I got the wrong size for the knob, so that's not getting used. Instead, I disassembled the original and am reusing that and the spacer. Which, now that I look at it... I could have removed the spacer and reused the "broken" cable as it would have given me JUST enough length. Rats.
Stuck the new wire through the hole and pushed...
Then attached the screw doohickey that prevents it from coming back out when you yank on it:
After that, it's just a matter of throwing the rest of the crap back in the fuel door cavity place thing.