430 Subwoofer speakers

Scuderia Audio has exactly what you need: https://scuderiaaudio.com/product/360-430-oem-bass-upgrade-2-0/
It's the only kit on the planet that allows you to keep your stock speaker grills to retain that all-stock look.
They've sold several hundred of these kits.

 

I replaced them with these Polks, around $150, no mods needed
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I'm no audiophile but they sound great

 

The original speakers (and passive radiator) frames (baskets) have high side walls. The original grills have four "hooks" that clip onto these walls. The Scuderia Audio set has laser cut stainless steel adapter plates that have the same high walls with the same dimensions. The original grills hook onto these plates just like they hook onto the original baskets. If you simply push the original grills back into their locations with nothing for them to grab, they'll just rattle back out.

 

Yep stock screens fit, no issues.

 

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My 24-year-old tires on my 360 finally wore out. But instead of buying high performance replacement tires, I had my original tires retreaded. Saved a lot of money.

 

Hifi system upgrade going in. Scuderia audio amp and speakers. I wanted to retain the original look with better components. Great customer service and support!
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I went with focal's .perfect fit.