Large indash flasher?

[BigCityBubba]

Another issue I have with my new to me boat is that there is a 4 inch hole in the dash where a flasher used to be. Do they still make them or is there some kind of insert I can use?

 

[KyRick]

Most put a Blue Tooth radio in the hole, fits perfectly.
Amazon product ASIN B09SWK7MQY