Offshore type replacement pads are available at Seattle Marine and Fishing Supply at fisherman's terminal. They also have the best selection of plugs, spoons, hootchies, flashers, etc. etc. you'll find anywhere.

Sky Guy's tubing method works great - use a little vaseline if it's too tight of a fit.
_________________________
. . . and God said unto them, Be fruitful, and multiply, and have dominion over the fish of the sea . . .