Hi Bruiser,
If you are handy with a welder then its no sweat to knock up a bracket yourself. I made a bracket for my cruiser using angle iron and a couple of pieces of flat bar. All of the existing holes that there are in the engine bay (believe me there are plenty) just need a plate welded to battery frame and a hole drilled to mount to existing hole. Thus you dont have to butcher around to mount bracket. I also made a bracket usinfg existing hole on the engine for mounting intercooler. aAfter abit of trail and error you should get it right. I put a piece of rubber into the tray and made 2 J bolts to tie in battery using a flat bar accross the top. The flat bar was painted then a piece if shrink sleeve plastic put over it. Never had a corrosion problem with itand battery never ever moved.
Regards
Willy