Has Anyone Upgraded Speakers on a MT573?

[wjb-49]

I would like to upgrade the speakers in my MT573 and would appreciate any advice from an owner who has done this. Looking at other threads regarding upgrading speakers in other LG tractors, it appears that the speakers are located in the cabin ceiling and are relatively easy to access. Speakers in the MT573 are located in the cabin walls behind the operator and do not seem to have an access panel.

Thanks in advance for any assistance.