It is now more than a year later, and you have yet to acknowledge if the flasher works for your 6 lights. I have a lot of patience, but at my age, I am running out of years to wait for the results...
I hooked mine up yesterday, and the flash pattern was quite fast for my 6 bulbs, and that is why I asked about yours. I have gone down a different road, using a Dietz headlamp flasher with a slower flash pattern. I am in the final stretch of getting all the electrical work done, and all that is left it to install the Federal Model Y siren. Off with the WLR, and on with the Y or would it be a YR, since it has a rear flashing light. Have no idea where my old Federal catalog is located, so hopefully someone on these forums will have the information.