1992 Oldsmobile 88 car audio help

[porksoda 10+ year member]

Well I have a 1992 Oldsmobile 88 that I just recently got.

The vehicle comes with a factory cassette player and I believe all the speakers are blown. I think they are blown because some play and when I hit a bump while driving some will stop playing and some will start playing.

Very weird lol.

The plan is to replace all the speakers, head unit, and maybe a small subwoofer.

I don't want the most high end audio equipment but just something decent.

Anybody have any suggestions for me?

How do I figure out what size of speakers my doors take?

What size of subwoofer and amp would be good for me?

I don't want nothing huge. Just something to make a little thumpage.

I was thinking of going to Walmart and getting a Walmart Special head-unit but I figured I would check what everybody suggest here.

Thanks alot everybody!

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[porksoda 10+ year member]

Also on the speaker topic what should I use.

Component set or coaxial speakers?