Mountain Bike tyre (Durkar WF4)

Has anyone got any mountain bike tyres size 26 x 2.1 (54 x 559). I’ve been gifted a bike which I’m doing up for someone who is in need and hopefully will be helpful in getting him to and from a job. Alternatively if you’ve got a man size bike (ladies or gents) that is ready to ride, and you no longer need it, that would be exceedingly appreciated as I’m having trouble sorting the gears out on this one. Thanks for reading