need flywheel housing for 351 ford to DP

Help, I need a flywheel housing for a '95 volvo Penta drive train. It has a 351 Cleveland engine to a DP outdrive. I'm told this is a rare set-up. Volvo Penta says it cannot locate this part (#3856699) and has to make one from scratch. They are telling me it will take a month to ship it!
I have tried to search for both new and used to no avail.
Any help is greatly appreciated,
Paul