West Marine and Boat US will have 'em - but most likely NOT the original type. Watch ebay auctions, go to marine dealers and ask for the service guys in the shop and see if they'll let ya dig thru boxes of old junk, steal one from a different boat (I didn't say that did I?), go to swap meets of the Antique Outboard Motor Club (www.aomci.org) and Antique & Classic Boat Society activities (www.acbs.org) and classic snowmobile groups, look for boat junk yards, etc...
Andreas - Cruisers, Inc. 570 is a 20' Seacamper -Duh- I am aware of all those sources - been there done that. I crawled around local old boat dealer yesterday, found some cool stuff but not what I was seeking. Was hoping one of us might one laying around the excess parts bin, I know I have one!
Dan Stober
1965 20' Cruisers Inc. 570 Seacamper
1962 20' Cruisers Inc. 502
1963 16' Cruisers Inc. 202 Seafarer
Weatherford, Texas