Looking for options on jet upgrade to my 21ft Anthony day cruiser, Currently stock 455(as far as i know) and Jacuzzi YJ.  I know there is little to do to the YJ other than a energizer kit, and a Berkley is not a direct drop in. Question is since the Berkley is smaller than the YJ are there and adapter plates available or is the only option glassing in the difference? I have found a few people talk about seeing a adapter but have not seen one for sale.  I can get a old boat with a 455 to rebuild and a Berkley for under $500 vs the Energizer if a adapter is available.