that's something i haven't seen in a long time is those portawall things, didn't know that's what they are called either. there is a couple of old school tire shops around here that i use the odd time for truck tire repairs and i will ask them if they have or know where to look.
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"if you are not the lead dog, the view is all the same"
I'm right in the midst of replacing my current set - ( one has a small tear ) -- They are ( new ) on E Bay for around 100.00 / set and come from Turkey . About 10 days shipping . ( Mine are on the car in my avatar photo ) -- Hope this helps -- LATER -- DON / FLEET 51