Is that not only for the pointy models though?
Mine's an X-reg Curvy.
Keith: Hein Gericke bless them, have made things a lot simpler for folks like me, and colour-coded the wiring so you plug it in the right holes. If you plug it in the wrong way round, the indicator doesn't flash at all.
Now, here's a piccie of the new indicator, and the resistor:
Also, here is a vid of the flash rate. This is with both the front and rear indicator installed on ONE side only (The same side before you ask!):