If the pipe is a very loose fit, its most likely that the next size up O-ring will fit tightly.
You can always just spin a few thou of the spigot in the lathe if necessary, to get the oversize O-ring to fit neatly.
I know, PITA, to have non standard parts.
K
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08 TXT 300 
06 Gasgas EC200
03 Gasgas EC300
05 Pampera 250
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