I doubt that you will find spares for a 40 year old coffee percolator, not economical to keep cheap spares in stock for that length of time. Plenty of them for sale on e-bay though.
A M
May 2014
I can answer this question...
I need a rubber seal for my sona Coffee percolater?
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix coffee machines.