I cant find the specs on the Lucs HP12, but If the primary resistance is over 3 ohms, you don't need a resistor. I would actually buy a Bosch or Beru blue coil and dump the resistor completely especially if you cant find a suitable resistor.
Amazon.com: Empi Beru ZS 172 Blue Coil, 12 Volt Primary Resistance 3.5 Ohms VW Bug GHIA 1200-1600 : Automotive
WWW.AMAZON.COM
Buy Empi Beru ZS 172 Blue Coil, 12 Volt Primary Resistance 3.5 Ohms VW Bug GHIA 1200-1600: Coils - Amazon.com ✓ FREE DELIVERY possible on eligible purchases