Very specific Porsche wheel sizing question

[Acast94]

I've done a lot of searching and haven't found anyone who's used this setup yet.
I have a 2000 Porsche Boxster S with:
Front- 18x7.5 ET 50
Rear- 18x9 ET 52

Current stock Tires:
Front - 225/40R18
Rear - 265/35R18

I just bought a pair of used Panamera wheels that are:
Fronts - 19x9 ET 60
Rears- 19x10 ET 61

Tires on the Panamera wheels:
Fronts 255/45R19
Rear - 285/40R19


Long story short they are way too big, should've known.
Someone with experience sizing wheels for our 968s please tell me what tires sizes I will need not to have rubbing issues. Thanks in advance