Hey, what's that? A stock 71-73 tii wheel I found in a shelf in summer of 2015. A slotted three-spoker. Spokes rusty and the foam... Gone. And now, what to do with it? Paint the spokes, yes, but the foam? I'm not familiar with replacing or shaping foam. Oak sounds some similar, so let's go oak.
The wheel's core:
Hm... A kind of oval steel profile around. I started a first try to find out what's doable: