if you need a dual cup holder, that means you have a passenger. If you have a passenger, make them hold your drinks!. Kidding, I've never seen a dual. Only the ashtray replacement single
He-he. My passenger might spill soda or coffee on her nice expensive Ferrari jacket when I drive inspirational. There are plenty of universal cup holders on the net, but someone else must have been interested in having one so what can fit? It is also quite easy to make one by yourself as the tray has a boxy shape.
I think the best option for dual cup holders would be to use the pop out ones from VW/Porsche used in the 911s and some other cars, then create a custom bracket to mount it below the stereo receiver. These guys: https://www.ebay.ca/itm/New-Genuine-Porsche-986-Boxster-996-Carrera-Pre-Facelift-Cup-Holder-Retrofit-Kit/223948298030?epid=1570348785&hash=item34245bd72e:g8QAAOSw5eReb3TK If you're the type that doesn't even use your stereo, you could just take the head unit out and custom fit this into that slot. You could also have an amplifier that uses Bluetooth only for receiving audio, then retain your stereo as well.
