<VV> '62 Rampside Duct Seals

[Office 2004 Test Drive User]

After 43 years I thought it was time to clean-out the hot air duct system of
my Rampside. Only problem is I can't seem to find replacement seals. I need
rubber for the duct connections,and for the flapper doors in the metal
heat/air adjustment box mounted with the blower fan.
Anyone out there know where I could get these seals, or how about some
Homebrewed solution?

         Thanks,
 Not Hot Under The Collar Yet