Tire Valve Stems/ proper tire size

whats the story with the tire valve stems? i have a 1981 240d its time to change the treads. i noticed the valve stems have a hex lock nut should my local backwoods tire shop carry that style stem? or do i need to order a set up? do you carry them? what should i replace the tires with (size wise) the origials were a 14 SR or something like that. what is the modern equivilent ? Thanks ASP

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