Ideal Size for Diamond Racing Steelies

[Mystikal]

+12 205/45. Done

[Blackout]

I don't want to destroy my fenders.

I don't want to stretch the shit out of my tire.
?

Pick one...

[ramielm]

I've been researching this for about 2 days and there are so many different answers that I'm confused!

My Car:
1991 vert, H&R cup kit and M3 offset control arm bushings

What I believe:
for a 16x8 rim, the ideal offsets would be +12(5" Backspacing) and +0(4.5" Backspacing)

With these fitments, I would have to grind down my caliper bracket and they would fit fine and flush.

I don't want to destroy my fenders.

Questions
Is this the ideal fitment?

What is the best size tire to run (I don't want to stretch the shit out of my tire)

If I grind my bracket down I won't need a spacer correct?