Please if you are going to do a bulk buy please have everything sorted beforehand.
Like laser cutting availability at a set price per batch, machine work availability at a set price per batch, material, etc.
That way you can ask for a downpayment to cover those costs and leave the balance to cover postage & handling and your cut.
Edit: here is a link to a small run machine shop in Melbourne
Macquarie Precision Engineering - 3D CNC Machining, Turning, Milling
If you can measure and e-mail me your dimensions including a plan view pic with scribe/pen line of the hub ears that would need to be machined down.
Along with the spacer length that you used.
I can have a 3D Pro-Engineer model e-mailed back to you by Tuesday.
No pressure just trying to help you get the ball rolling.