It was 58mm on my 1.4 16v, yours is most likely the same I think i linked you to the coilovers i got - they can be had on the cheap for about £248/best offer on ebay to £220.
They look good, but the ride will be pretty stiff, if your sunroof doesn't squeak now, it will after haha.
hm mines the 8v alizé though.
It was squeeking when I opened it (mum never used it when she had the car) so I put some WD40 in it and it's fine now
I'm just unsure of how low I can go due to my stupid driveway, it's like this /\ haha.