Diameter of Trumper hard soap refills

Just got Trumper Limes cologne from a friend who went to London (payment for driving him to the airport on 30' notice:D) Liked it so much, I ordered a sample pack. Also toying w/ the idea of getting some soap (again probably lime; I love limes!)

I have one of Colleen's soap bowls (measuring exactly 8.5cm interior diameter). Does anyone know the size of Trumper's soap refills? That way I wouldn't have to pay for the bowl too (they're not exactly cheap as is, and with the current exchange rate [USD to GBP]: :gth

UPDATE: Disregard; I found the size--it'll work!

Further update: it required a little "reshaping" to fit. I stuck the shavings at the bottom. When the cake runs out, I'll grind said shavings up & pack them in a little bowl like those soap things Oskar sells with his scuttles!:)