Volvo used three brake rotor sizes: 300 mm, 316 mm, and 336 mm. My vehicle came equipped with 316 mm rotors.
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Noting the below for my records:
Even after wheel balancing, alignment, brake rotor skimming, and brake pad replacement, I still noticed a slight shudder during braking at high speeds. Determined to resolve this, I opted for a front brake rotor replacement. Sourced 316 mm (16.5-inch, as per Volvo’s specs) rotors from a vendor in NCR (Kashmere Gate) and had them delivered to my location. They are heavy and each rotor is approx. 9.5 Kg in weight.
Trivia: For the S/X-60 of these vintage models, Volvo used three brake rotor sizes: 300 mm, 316 mm, and 336 mm. My vehicle came equipped with 316 mm rotors. While I considered upgrading to 336 mm, it would have required replacing calipers, dust shields, and brake pads, so I decided to stick with the original size.
The replacement was done at a FNG in just 30 minutes and was just a matter of removing 2 bolts holding the caliper assembly, removing the old rotor and putting in the new rotor. 
The OLD rotor:
Result: no more shudder, and high-speed braking feels confident and smooth.
While there, I also got the car a quick foam wash.
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