Being no Bose is a good thing
, Bose is nothing more than designer Hi Fi believe me your better off without it.
I have never put speakers in a 33 but from the looks of the dash and doors at a guess I would think they take a 6 x 4 in the dashboard location.
For the rear I don't know where the standard speakers are...
When choosing your new speakers try to go for a speaker manufacturer rather than a company that makes speakers as part of their product portfolio, the difference in quality between the two is astonishing.
I would recommend you look at Focal, Morel, DLS, Hertz, Rainbow as some examples rather than Sony, Pioneer, Alpine, Kenwood etc, the Japanese make great electronics but their car speakers leave a lot to be desired.
Find a local car audio specialist rather than a car accessory store, ask their advice and audition some speakers, they should point you in the right direction.