In response to many requests: here's a few pix of a Transistor Ignition I just installed Sunday into a local owner's [beautiful!] CB550K. There is a hollow space behind the battery tray that will just fit the box, and 2 (crossed) Ty-wraps hold it securely to the back lip mount. The wires then run between the upright of the battery tray's middle support (flatly, please...) and join with the points junction at the front of the battery, to the right in these shots. The Green wire goes all the way to the points plate, where the ring terminal is grounded under a condensor screw (that pic is my 750, you can see the ring terminal at the very bottom of the points plate, the bottom screw). The Black wire just runs up to the coils where it plugs into the Black-White junction, and that coil's Black-White wire plugs into this Black one's wye connector.
