Can anyone confirm Celestion Ditton 25 HF2000 tweeter impedance?

I'm rebuilding a pair of these and need to know whether this model uses the 8 or 4 ohm version of the HF2000 to make sure I order the right diaphragms.
The only schematic I could find is one someone drew up and simulated, and it says 8 ohms. Can anyone confirm?

Both tweeters are dead so I can't ask them.
 
What am I looking for on the crossovers?
From what I can tell this schematic seems accurate. But it is the only piece of information I've found at all giving the impedance of the tweeter. So I thought I'd ask to see if I could get any confirmation.
 

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