If you want it to stack with Mage Armor and Shield, a deflection bonus might be the best fit.We will run a short DnD 3.5 campaign and I don't remember anything of the rules.
I need to convert an 5E item to 3E5: the Staff of Defense.
It basically let you cast Mage Armor and Shield.
But it also gives the wielder a +1 AC.
What sort of bonus should the AC be?