Which loom adaptor for 1997 Corolla?

[Rigpig]

Hi,

I have a 97 Corolla sedan with what I think is the original radio cassette. It's just about dead now and I want a new unit to slot in. Trying to google which adaptor I need is a nightmare. Could anyone point me in the right direction please.

Also are the door speakers standard sizes or do I need adaptors for those as well.

Not looking for anything flashy just a reasonable clear sound as I mainly just listen to radio in the car.

Thanks

[Dell'Orto]

Most of the aftermarket looms will be a 540...Raptor/DLG will be WH540 for example.
Pretty sure stock speakers are 4", so you're a bit limited for reasonable sound.