can non-magic classes that use magic get bonus spells?

[probe53]

based on the chart, INT and WIS can give bonus spells.

do the bonus only apply for the priest and mage class/sub-kit or apply to classes that can use mage/priest magic but are not mages/priest themselves?

ex. ranger--> stalker (mage spells it gets)

[Crenshinibon]

A stalker gets no bonus spells from Intelligence but Benefits from Wisdom.

Any multiclass/dual class variation with cleric and mage classes gets bonus spells with Intelligence and Wisdom.

Bards do as well.

If a class naturally casts divine spells, but gets some mage spells like a Stalker or an Avenger, Intelligence does not provide bonus slots, Wisdom does.

[probe53]

so stalker just get the priest bonus spells like all the other rangers...

its mage spells are set in stone.. no increase eh?

[Crenshinibon]

No increase. Spell progression just like other rangers.

[kmonster]

It seems that you're confusing the BG2 with a 3E game.

In BG2 high wisdom can grant a few low level bonus spells only for clerics and druids.
Int only affects the number of spells you can scribe for mages and bards.