Cassette Adapter For Radio

I am looking into putting an aftermarket radio in my 98 Blazer but I don’t want to lose the cassette player. I don’t care if I have to put the radio on aux to hear the cassette. What I am looking for is an adapter for the cassette hook up so I can put it to the radio.

Thank you

Why not just get an aftermarket with both CD and Cassette in it?