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It's a 51mm tamper, I just got a generic £10 one but I do advise tamping on the lighter side. Not sure if you caught James Hoffman's recent Europiccola video but tamping at the pressure I was used to would result in relatively little water passing through the centre of the puck compared to the edges.
On that note, I'm not sure if your one comes with a bottomless portafilter, but I definitely recommend getting one. This site has a pretty comprehensive selection of parts: https://www.theespressoshop.co.uk/en/Spare-Parts/c-49.aspx?BrandIDs=42
Gotcha - cheers!
What basket size is it by the way? I can't seem to find this anywhere, and I need to buy some sweet overpriced tampers.