Well I'll answer my own question in case anyone is searching.
The guy at Hunter suggested putting in lag screws, which is not ideal,
but pressed for time, that's what I did. I drilled into the led with
a 3/8" bit, and put 1/2" stainless steel 3" lag screws. Note of
caution - use plenty of wd-40 or some lubricant or the bolts can get
hot and bend. Hand tightening the screws is the way to go.
A more ideal solution, which I'll do later, is to drill into the side
of the keel to meet a drill straight down, and put in half inch
stainless steel or bronze bolts. Put the nut in from the hole in the
side and fill the hole.