Steve, can't help much mate, except to post this link to a previous similar problem. May be an answer there.

http://www.hdforums.com.au/Default.aspx?tabid=71&view=topic&postid=230200

Burto.

They should have them. They're about $15.00 . Just a hint to lubricate it really well when you put it on. I pinched mine, and the bike was fine and I only noticed a very slight loss of power in the high rev range. I hear that aftermarket seals ( I think the company that makes them is called Kinetic ) are a lot better. Hope all goes well.

Glad to hear you got it sorted Steve....

Did you stay with your 204 cams?? interested to hear what you think of your new set up once you have broken her in.