Need a new am fm radio/ player for my '81 k20

[GSP7]

I had a 20 year old pioneer 3939 am fm cassette radio in my 1981, Finally crapped out

I still have the dash metal for the two knob holes intact , not saw out completely for a slide in stereo

I havent even shopped for car radios cassette or CD in many years

Can anyone recommend a inexpensive good unit. Are they all slide in no days or are two stud knob, still available to fit the original dash holes