Maybe so, but it is a lead to a seller who may have the correct part.
It also leads one to the eBay category where the part may be found.
You gotta start somewhere.
My '64 U320 original door cards are a bit different from Waynos.
I will try to get a pic later.
Kwoo, not sure where you are but, this may be helpful.
http://community.ratsun.net/topic/62161-headliner-fabric-source/page-1?do=findComment&comment=1084521
Oops. Sorry I forgot how we do some things differently here 'down under'.
I have seen them in the two prong version. There may even be other combinations too.