Originally Posted by
Leisesturm
Your LBS can really help here and I don't think you will spend more than if you went mail-order. There are some flashers, are you sure yours isn't one of them, that will bolt directly to the tab you mentioned coming off the rear of your rack. There will be a plastic nubbin on the back of the flasher which goes into one of the two holes and the screw threads into the other hole. This is to keep the flasher from rotating if the main mounting screw gets loose.
Planet Bike rack mount hardware is for Planet Bike blinkies, it will work with some others. Best, cheapest flasher I know of is by ViewPoint. I get mine at Performance Bike. All the cool light patterns but I never use them. Just standard flash for me. I'm so boring.
H
Let me echo two good bits of info here... (1) the PB mounts are different, and may not work for many other lights. I've got a few different brands, but none of them fit into my PB mount. (2) Go to your LBS. In addition to getting some good advice, if you're a regular customer and you mention you're looking for a cheap way to mount it, maybe they'll go through their stash box and find something that would work.