Clutch Replacement/Update

I have a 2006 DCSB 4x4 with a 6-speed manual. I am thinking of replacing the clutch sometime in the not-so-distant future as the truck has over 300k on original clutch:

http://www.tacomaworld.com/forum/2nd-gen-tacomas/244798-300-000-miles-today.html

I know there were updates to the clutch/TOB etc. in 2007 and perhaps 2009? Have there been any updates to any of the clutch system components that I need to make sure I get updated during the clutch replacement? Any relevant TSBs on the clutch?

Are the updated TOB sleeves working OK or should I go with the URD one?

Thanks for any info!

 

Any thoughts?