Question. What is the biggest possible sink I can get to fit in my 24" sink base? Believe it or not, we get this question a lot. There's good news and bad news. Let's start with the bad news first. You don't have a lot of shape options for this sink base size. In fact, you have two- a rectangle or what we call a "D" sink. [It's a sink that looks like a capital letter D on it's side]. The good news? We are here to help, and walk you through all your options.