Alternatives to Andymarks 8mm key hub

[ohhs4284]

With Andymark's 8mm key hub sold out, what are our alternatives? We're looking to mount a wheel to a CIM, but our options as far as gearboxes are concerned are limited because the piece we had fabricated to hold the motor doesn't provide room since we didn't expect to need a gearbox. So, what other systems could we use to mount without taking up too much room, or where else could we find an 8mm key hub besides Andymark? We would be willing to buy one off of another team if possible. Thanks.