I'm 99% certain they are ROUND .............. (went to Square in 2006/7 Standard Disc brakes on rear from THAT year) ... BUT ... if fitted with Discs & ABS they are SQUARE <<<<<<<< THATS where it gets VERY Complicated !!!!!
"Rule of Thumb" is ...........If you have Brake SHOES on the rear they are ROUND ..........................If you have Brake DISCS they are SQUARE .....