Choppin steel builds sissy bars that fit in the struts that you buy from BDM. Unfortunately BDM doesn't offer a strut Sissy bar package for your 03 so your kinda on your own.
I am having one made now from choppin steel for my 03 & it will bolt to the struts [with some drilling & tapping] Eric could make it any way you want they start at 200 & up depending on how fancy you want to get