baretta 280mm is wilwood disc i believe bro. maybe wrong, but thinks thats it.
and at wastegate, i have 15's so theres ya answer dude.
and i have auto x's which are notorious hard for bigger brakes.
What about Alfa Romeo Mito discs brake??
They are 4 hole , 281 diameter , 44 height and thickness is 26/24..
I think that will fit perfect at st185 calibers.
I dont know much about that topik but i am starting to learn!