Don,
I hooked up the Street Glide rear light as both a tail light and brake light. I theory is you can't have to many tail or brake lights! I also added a led running/brake light strip under the tour pak. Kind of like my Rinehart theory - if they hear me they might not run into me...
Scott
Ah, you must have got one of newer bulb assemblies

. I bought mine just before those were released. It was just a single element piece and I was too cheap to buy another one right away and just throw it in the trash.
My tour paks have the spoilers on top of them. Brake and running light functions there and nice and high. The paks aren't on the bike half the time so when they're off hopefully the spoilers on top of the saddlebags replace the lost visibility a little. If my tour pak was fixed I'd have wired the street glide light like yours and hung more light on on the pak too. With the on-and-off nature of mine, however, had to do it differently.