Go to my web stie.. Click on the Red car at top of this page,
Go into my Parts list.
near the very top is a part # for Volvo penta, bellows..
They will work on Amphicars and a designed to do the very same job on boats,,
they are a bit bigger but will tighten down perfect if you are carefull. alway double check and 1st water test you should alway look for leaks..