LOOK - Look at them!

1) It's got carbon forks with a 1" threadless steerer tube.* I've already
got a 3T ARX pro stem which is designed for a 1 1/8" steerer.* Am I correct
in thinking that I can buy a 1 1/8" to 1" Stem Shim such as follows?
http://www.evanscycles.com/products/thomson/1-1-8-to-1-stem-shim-ec055735?country=GB&currency=GBP&utm_content=mkwid__pcrid_17321847296_kword__match__plid_&gclid=CK325fq6ob0CFe3ItAoddFQAhA
Are they a good idea/safe?

100% fine, and the Thomson shim matches the height of the ARX stem perfectly.