the easiest way seems to be to use 'L' brackets
bolt them to the tank bolts and use self tapping screws to mount to frame
I have used the original mounts turned upside down and screwed to the frame as well, but they always beak around the middle screw to the frame
hope that helped

__________________
Bill (aka azbill, aka azkronic)

yesterday is history,
tomorrow is a mystery,
but today is a gift...
that's why it's called "the PRESENT"