When I received the Crystalyte motor with matching front wheel, the front wheel was missing the 20mm thru axle. I couldn't use the thru axle either but needed some way short of switching the hub to a QR hub!
Googling around, I spotted these at Pricepoint.com.
They fit perfectly into my axle-less front wheel and look great. The bearing spins freely and the adapters are a very precise fit. It's a great solution for low $$$.