Probably your best bet is to find an 8" handle and have a machinist modify it for you so it will work.

:: Does anybody have an older model Lewmar '8' winch handle
:: for sale?
::
:: Inevitably it happened....loaned boat out...crew dropped
:: the winch handle overboard. The same handle I'd lovingly
:: taken care of for 13 years!
::
:: Lewmar said, "good luck finding one"

:: Steve Seal said, "hmm, that may be a problem"

:: West Marine said, "hmm, better check with some of the
:: consignment stores (ie Blue Pelican) so I've left a
:: message etc.
::
:: Help, help, help.
::
:: Most importantly of all thanks for learning of this and
:: hopefully responding.