Replacement advice for Marantz Driver

[Rob11966]

Hi Speaker Folks,

I am normally to be found in the tube amp section and unfortunately know very little about speakers, so apologies in advance for my ignorance.

I have been asked by a friend to help him replace the drivers (ruptured cone) on a Marantz speaker. I am looking for some advice/guidance.

The drivers do not appear to be branded. They measure 7 inches in diameter and are labeled -

D20FU90-04F 8ohm
Taiwan 648304

The speakers are an old pair of Marantz LD25 75w speakers.

I have searched the internet but cannot find any specific reference to the speakers or drivers.

Does the reference code mean anything? Obviously they are 8 ohm impedance but that is about all I can make of the code.

Can the driver be replaced with any 7 inch 8ohm driver? If so any advice regarding brand?

Thanks in advance for any advice.

Rob