I've found this Ebay auction for Brembo Part No. 49240821A which appear to be the same:
https://www.ebay.co.uk/itm/Front-bra...53.m1438.l2649
Bolt hole diameter: 8.5mm
Number of mounting bolts: 6
Part manufacturer: Brembo
Manufacturer Part Number: 49240821A
Outer Diameter: 300mm
Reference OE/OEM Number: 49240821A, 492.4.082.1A
Inner Diameter: 64.2mm
Brand: Ducati
Disc thickness: 4.92mm
PCD: 80mm
They have them listed for:
Monster 620, 695, 800.
Multistrada 620.
Nasher.