Not sure I can help, I have a Euro 16v spec one laying around if you'd like to know the spec of that I'll run out and measure.
If you're thinking of upgrading I'd recommend going big, they're the best thing I have done to my car handling wise.
I have Neuspeed front and rear, biggest available for the mk2, 25 and 28mm respectively. They weigh a ton though so not sure I'd get the same brand again.
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