I swap my Impala 96 to 411pcm I installed 24x reluctor which crank sensor did I need

 

Good morning, I don't see where anyone replied here, but I believe that ALL gen III LS motors (24x reluctor wheel) use the same CKS. The GM part numbers for the GEN III V8 crankshaft featuring a 24x reluctor wheel are 12551520 and 12559353. Hope this information helps and I know it's been a month, but I just saw this this morning.