I bought 2 used zip dee chairs from a WBCCI member. I have no idea how old they are except to say "old". However, they exactly match the blue striped awning fabric on my 1987 Sovereign.
Ordered new fabric for them and when it arrived they were an inch or so short. Zip Dee's service people had assured me there was only narrow or wide and length was not an issue. Apparently these chairs are older than the years of service of the zip dee people who filled my order.
To make a long story short, sent the new covers back with one of the old chair covers, talked to them and they made me new covers to the length of my old chair cover.
Thanks to Zip Dee. Customer service is not dead but then, I did not order them from China.