Stupid Clip On Question

Quick question. It might be dumb but I want to make absolutely sure. I’m looking to buy Clip Ons and I know I need a 1.5 inch riser however do I need a 41 or a 43mm? I have a 2009 FZ6R. I only ask cause I read on specs it was a 43mm tube and from the research I have done on here says use 41mm. Thank you in advance.

Sent from my iPhone using Tapatalk