Trying to fit new rear pads to 2006 SuperGlide ... I can get the three main 12 point nuts undone, but f****d if I can work out what size socket goes on the two small retaining bolts, which are also a 12 point 'splined' bolt head. I thought it might be a 7mm or 15/32 but these don't grip....think I've already stripped one..  please help before I go any further??

..and not looking for replies that say 'get a shop manual, dude'  ...if I was going to spend lots of time pulling it to bits I probably would!

cheers mate, I'll get meself a 1/4 inch