I found this pic while eBay surfing - it's a NOS Sierra front hub, nicely labeled with diameter dimensions. I was hoping it might be a Cosworth hub, but no luck.
Threaded axle: 27mm
Axle: 38mm
Bearing carrier: 53mm
Interesting that the thing they felt needed beefing up the most was the threaded axle.
The comparable dimensions for a Scorpio or Cosworth front hub are:XR Vs. Scorpio Front Hubs
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