Question HP workstation weird 4-pin PWM adapter

[foroomate]

Hello,
I have an HP station with 4-pin fan connector but the plastic notches are different, the plastics are over pins 1 and 4 and not 1 and 3.
Now I want to replace the fan and I want to know if the pinout is the same, and if you think that I can find such adapter from regular 4-pin to this weird wider 4-pin

Thanks

 

[RealBeast]

Find the HP service manual on the specific model, it should have pinout details.

 

[foroomate]

There is no: https://support.hp.com/us-en/product/hp-compaq-dc5800-small-form-factor-pc/3658082/manuals

But I can just use a multimeter, however it doesn't solve the problem of actually finding such adapter, this is how the connector looks like: