iMac 2020 keyboard

Hi all recently in February bought a refurb iMac 2020 from apple. I love it I can do a lot more with it being a larger screen.

One problem since I bought it, as they come with the tiny white keyboard, also since I bought it my eyesight has changed so I cannot see the letters/ numbers on the keyboard. so, therefore would prefer the black with white letters etc. But going round and Round in circles trying to buy another black keyboard as try as I might messaging a eBay seller selling them and they're totally ignoring messages.

plus I do not know which keyboard will match up to the 2020.

any help would be appreciated 

“What we’ve got here is failure to communicate.”