I don't know whether the A5 opening would work. The first time I called, Douglas was quoting around $105 plus $10 customization plus $10 drop ship on a generic custom 10 inch. I didn't have the particulars then and was still thinking Red Label style.
This last time I called they said they had found the old pattern and knew that the center opening on the Red Label style wheel for the 4/125 bolt pattern would be 4.187 inches. I didn't think to ask about the A5 opening dimensions, but it looks like the A5 changes significantly based on the bolt pattern.
Does anyone have a disassembled rear wheel from which we could get a pencil tracing with measurements that could be scanned and e-mailed to Douglas?