My 2008 GSA has a smattering of E Torx bolts on it:
1) Bars E10 and E12
2) Bash Plate E10 and E8
3) Gear Change Lever E8
It is not easy to buy the E8 , E10 and E12 in a hurry individually.
I spent around $30 getting a set from E5 to E20 at Toolmart (I needed them to change the oil on the bike so could not wait for individual sockets to be ordered in)
Bunnings sell a similar kit for $35

The other option is spanners/sockets
I would have rather purchased the E Torx Ring Spanners particularly to use on the gear lever (Sockets are better on the bash plate)

I still would be happy to get E8/E10 and E12/E14 spanners.
Bozo