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PCB size is 18 x 18 mm. You can buy all the parts and the PCB using Kitspace.
The PCB includes the recommended SiPM biasing and an (optional) 2x3 pin header. On the front side there is only the sensor itself while all the other parts are on the back. This ensures good optical contact and light-tight sealing. Both sides have ground planes and the unused SiPM pin number 4 is connected to them for some thermal mass.