My appologies, I have an Extra in the box and you are right, it's the kit! I guess I haven't looked for supplied hinges becuse I don't use them.

Try the Robarts, you can practice on spare balsa. The drill guide makes it easy. Before I glue them in, I layout the hinges and put a small drop of 3 in 1 Oil on the hinge part. This will keep the glue from adhering to the hinge if I get sloppy.

To make sure the hinges are aligned, right after install I rotate then up and ensure they are 90 degrees to the TE surface. You can also install (not glue) the control surface and flex up and down to again check for alignment and any binding before the glue sets.

BTW, I love the CG Extra, what a great flying plane, enjoy,