Spinner for 3 Blade Catto

I've got an older 3 blade Catto with the thicker hub. I just ordered a hub extension with all the hardware and 3/8" crush plate from Saber. Now I need a spinner to fit this setup. I'm looking at athe 12" aluminum spinner from A/C Spruce. It's the SN-5. If I order the front bulkhead that goes with it it states that it's for a 2-1/16" hub, which won't work. Can you run an aluminum spinner with just the rear bulkhead? If not can someone point me in the right direction?

I ran those aluminum spinners for a time with front and rear bulkheads, I experienced a rash of cracks and one incident where I lost a chuck of spinner mid-flight. I would look for a composite or carbon fiber spinner.