Those are Missouri 4Runner beetles, they love 4Runners, once they start homesteading you can't get rid of them
, glad I don't live in Missouri!!!
JK
I agree bug bomb time, read the cautions carefully as to what types of fabrics that they suggest covering, I know most bombs says to remove or cover terry cloth, not sure why, also see if you can find one that specifically kills beetles and can possibly kill any eggs.
I would guess that these are carpet beetles, you may have to remove the console and seats to get them all, if it were me I would pull everything possible, then remove the carpet and spray the carpet outside the vehicle let it dry and air out, spray all the padding and let it dry and then vacuum it well, if you don't get all the larvae and eggs they will just keep coming back!!