I'm in France as well and couldn't find any supplier with a colour matching Light Smokestone for my ZT-T. I've done headlining in two other cars using headlining fabric supplied by La Boutique du Tapissier online, very good quality but they don't have any colour matching Smokestone, though their beige colour is a perfect match for my 75 with Sandstone Beige headlining.
I'm the one who gave Pete the advice for the Oatmeal colour from Martrim, after checking out their samples. It's not a 100% match but it's the best one I could find.
Here's a pic, be aware that pictures do not necessarily reflect real-life colours...
Be aware of shipping costs from Martrim to France though. It will cost you a lot more in shipping costs than the fabric itself. I shipped mine to my sister's place in the UK and picked it up on the way back from Roverfest...
upload imagr