Cinq front Speakers are 10cm / 4" . Be wary of coaxial speakers that the tweeter comes out far in front of... these make it impossible to put the grilles back on - I only found this out by running mine with the grilles off, but it looks OK and sounds great
Arse
1993 Cinq SX, with the world's dodgiest fuel tank! Free fuel? Folllow Me!!
I can heartily recommend Sony's XS-A1026 10cm speaker. They pop straight in and offer excellent high end definition, which is what you need to compliment you 6x9s in the back. Halfords sell 'em for £30-ish if memory serves.