I haven't been able to find any I've dug. Insole might not be the right word though. It's an arch support. I found one on eaby and it's kind of hard to see the metal part with the leather still on it but might give you an idea.I'm sorry I couldn't find mine. I've really got tons of stuff in my barn that I've dug over the years. Most of it really isn't worth anything but to cool to throw away. I'll keep this bookmarked and if I come across mine will post a pic.
the ebay auction is Vintage-Dr. Scholl's (1908) Men's Arch Supports