Brian, Thanks for your post. In cleaning mine up I believe they are sleeves on the top and the o-rings on the bottom. It is amazing that none of the top tier after market folks make these. Surprisingly, these items are really not well documented in the Packard Service manual either. Fortunately as Randy noted, a close fabricated equivalent should do the job. I agree that a heater hose with the proper diameter might be the ticket for the top sleeves. Best Regards, Robert.