Yep!! Volvo had a 302mm kit that came on some C70s and S70/V70 T5s. Stock 850s have 280mm.
I just installed my kit last weekend actually. No real improvement in braking, only in brake fade (less of it). They use the same calipers just different brackets and rotors. Install was easy! They fill out my 18s a lot better than the 280s.
Or there is the S60R/V70R Brembo kit that's a direct swap as well.
Or there is the 993 porsche/brembo kit which is also a direct swap.