Umm... the only person who has done swaybars on their Bonneville is Scoot Cook (owner of Intense) and he had custom ones done, don't remember the sizes. I will be making my own as well and depending on the size will be offereing it to other people as well in the future. Um... changing your struts right now is still iffy. I will be doing some custom down Koni adjustables on my car and seeing how it works also might offer it to everyone else, depends. So yeah... basically noone produces stuff for Bonneville'* except me and speedyguy. Good luck.
ADTR 1999 Black Bonneville SE
2003.5 Yellow Mazdaspeed Protege
2003 Azure Blue Mach 1 Mustang