SAMIKIVA (30 Pack) Tire Stem Valve Caps, with O Rubber Ring, Universal Stem Covers for Cars, SUVs, Bike and Bicycle, Trucks, Motorcycles, Airtight Seal Heavy Duty (Black (30 Pack))

Do you mean the little caps that go on the tire valve stems? If so, the standard generic plastic ones you can get anywhere should fit just fine. I would not use anything made of metal those corrode and then they adhere to the valve stem and can often cause damage to the valve stem when you remove them. Here is a pack of 30 for four bucks: https://a.co/d/067ZnCKl The cap should have no relationship whatsoever to whether you have an air leak. You can drive with no caps, nothing should leak. Your tire had a puncture. Unrelated. A valve stem itself can leak, however.