Jeep tire covers can be purchased from a number of retailers. One can buy them from 'eBay' and 'Amazon'. They are also available from 'All Things Jeep' and 'Tire Cover Central'.
Click the link.
Buy a new tire.
One can buy a brand new Jeep Sahara from the Jeep dealership. One can buy a used Jeep Sahara from Kelley Blue Book. Another place to buy a used Jeep Sahara is on Auto Trader.
The place you buy a new tire will dispose of the old tire for free.
A 15x8 tire with a five on five lugnut pattern will fit your jeep. You may want to consult an online tire guide to decide what actual size tire to buy, however, as larger and smaller sizes may be appropriate for your specific lift needs.
If the tires are on the Jeep, then they are already locked. The lock key is only for removing the tires (for applying work to the car, e.g. Tire rotation, buying new tires, fixing a flat tire, etc.)
Jeep tires tough enough for the Arizona desert can be bought from Edmunds, Discount Tire, 4 Wheel Parts, BF Goodrich and Ebay . They are also available from Jeep part and tire suppliers in Arizona as they stock the specialist tires for their desert.
The correct tire size for a 2014 Jeep Wrangler is P225/75R16.
The wheel should fit, the tire depends on the wheel.
You can buy 2007 Jeep Commanders from used Jeep dealers on your local area. To find a list of new and used Jeep dealers in your area check your local yellow pages.
One can purchase a customized Jeep spare tire cover in several different places. Some of the places that one can purchase a spare tire cover for a Jeep are: Amazon, sparetirecovers, and Tire Covers Plus.