Identify factory sway bar piece?

So here,

http://www.forabodiesonly.com/mopar/showthread.php?t=227050

Just (barely) got a late K in the car, spool mounts, better idler, new LCA bushings, and later, will swap to disk front brakes.

I also have a factory sway bar I bought used, and someone recently mentioned that evidently the 73/ later bars are different? than the 72/ earlier?

Do both go through the K? How do I tell? This is a used bar with no hardware. I'll have to build tabs on the LCAs