Third post from the top, the one thats ironicaly named READ THIS FIRST, is the one you want to.. Ermm im not sure.
zerothread/99647
More specificaly, to your exact question of what injectors fit the Ka's rail, read this --->
zerothread?id=109492
But to actualy answer your question myself, i would say you could get away with the SR 370cc injectors if you are running a t2 sized turbo. It kinda depends on your turbo.. You also have to have somthing to control the upgraded injectors. Read everything in that post then if you still have questions ask us.