4x T90105-17015 to get -2 at the front?
No to the parts, from me.
Toyota camber bolts have so many disadvantages that I believe
@Phil1291 refuses to use them.
There may be a Bank Holiday discount for Powerflex bolts soon, which are cheap anyway
. A decent alignment will cost you much more than these parts.
Leaving your rear camber intact, I would comfortably go for -2.5 front camber to start with, as long as you don't mind a tiny bit of compromise in braking performance.
I would also install a caster kit to increase caster, which would effectively also mean some (more) dynamic (negative) camber.
Toe, very subjective; I would keep a bit (eg the minimum Toyota allows or just over) of toe in at the rear and give it an equal bit (or less) of toe out at the front.
All that is probably more than a starter-for-ten which should bring a noticeable positive difference in terms of agile handling and reducing understeer. With a bit of luck, you will like it and stick to it. But there is a risk that it's just the start of a never-ending journey of costly exploration where changing one element affects others, you get used to settings and want "more", etc.
