The Nissan Altima 2002-2006 spare wheel (rim) part number from any USA Nissan dealership:
40300-L31010. Should be 66.1mm center hub diameter.
$184 new or $5 - $20 at a wrecking yard.
Lug wrench: 99545
The official Nissan spare tire for the LEAF is a T125/90D16 98M. The Jeep Grand Cherokee uses that tire, for instance.
The wheel (rim) part number is 403001ya7a that can be ordered from a Nissan dealership outside the USA. Good luck finding one. Price is big.
The jack part number is 99550-3ND0B and sells for UK £233.00 ($357 plus VAT and shipping and import duties). See above price of Altima jack in comparison.
The tool kit 99501-4J800 and sells for UK £113.00 ($173 plus shipping and government fees/taxes). You already have a lug wrench in a USA spec'd LEAF, so you shouldn't need this.
Sometimes the bolt pattern may be in English measure, which is 5x4.5 inches, or 5x114.3 mm. Also, Infiniti is a Nissan product, so the Infiniti J30 wheel may fit, for instance.
Here is the jack installed in its proper location in the LEAF: