2006 Monte Carlo 3.9, 3LT, with FE2 Suspension.

Here's my dilemma: I've been on a search for a new front end Stabilizer (Sway) Bar (kit) and am trying to hammer down whether I need the 33mm or 34mm.

Below info from Nalley GMC/Chevy/Buick
- Stock parts for 2006 Monte Carlo LT, 3.9.

SHAFT,FRT STAB. Required: 01 GM Part Number: 25861194
For: W RIDE & HANDLING SUSP(FE2) (2006-2009) (2006 - 2007).

So that's the stabilizer bar. ...and Nalley or Tonkin, for that matter DO NOT inquire about the size. Rock Auto shows the same thing but asks the customer which one? 33mm or 34mm. Which one is the softer ride? Yeah, I could measure it but I'm a little lazy right now.

Thanks, MC.