I got my 12mm spacers from Sportbike Track Gear. However, I had to drill out one side in a drill press with a 9/16" drill bit. As stated in an earlier post, I opted for longer bolts that I happened to get through my favourite dealership. Triumph brake bolts PN T3330331
As far as other years, I am pretty sure 2015-2017 R1 rotors fit as well.
After 9000 miles on my bike, one of the R1 rotors developed a wobble. They were from a 2005 R1 and had approximately 8000 miles on them when I got them. So, I splurged on a set of Braking SK2s. These are even better than stock R1 rotors, with more initial bite and feel.
Braking SK2 WK071R/L. The pads I am using are also from Triumph. PN T2020475, only $82 for 2 sets. I've used Vesrah RJLs but prefer the Triumph pads.