I am restoring a albatross continental should i fit a bow inflatable buoyancy bag, If so where should i get one.

Try John Fildes at Albatross Marine ...he sourced some to fit in the race boats at Oulton Broad

Try google, loads come up like this http://www.tridentuk.com/sailing/produc ... B2101.html.

I know some people have filled the space with inner tubes.

See also this thread which may not have come up on a search as I originally misspelled buoyancy !
viewtopic.php?f=6&t=5137&p=17594&hilit=buoyancy#p17397