Celestion Ditton 25 Tweeter Impedance

[Raccoon1400]

I'm rebuilding a pair of these, and both tweeters are blown. Replacement diaphragms are available, but I have a problem. I have no idea if I need the 4 or 8 ohm version.
The Ditton 25 uses the HF2000 which exists in both impedances.
The only thing I could find is a schematic someone drew up that shows all the drivers as 8ohm. But the woofer measures 4 ohms. So that can't be trusted.
These are a 3 way. 4 ohm woofer, two 8 ohm HF1300s in parallel = 4 ohm. 4 ohm tweeter too maybe? Or could it be 8 ohms?

Kind of stuck here, can anyone confirm what impedance the tweeter is supposed to be?

Thanks,
Raccoon

 

[Raccoon1400]

Here's the schematic I have. I know the woofer impedance is wrong on here. But the HF1300 impedance is correct.