If you get the adjustable upper camber links you'll need a very small open spanner to use on those. There are some high quality spanners like that but you might find it difficult to get them (or they'll come in a set of which not much else is useful - for R/C anyway). Have a look around. The aluminium tools you can buy from R/C shops are so and so (they do the job, but are not ideal). I found the ideal tool is one of those open end spanners and if you can get one double ended (straight and oblique) even better. I have a set of these but I got it in Germany, not sure if you could get them.

There are also camber links like that that have a hole for adjusting, but they're not Tamiya, not sure if they would be legal for what you need.