The only Z10 I am aware of is the Zaino Z10 Leather Conditioner. If that's what you are looking for, you will probably need to contact Zaino for a distributor in your area or order it direct from the Zaino web-site.
If you are looking for a good leather treatment, you might want to consider the 4 Star Leather Conditioner. It has been my choice for 2 or 3 years. Great leather smell without being overpowering.