In a large mixing bowl, combine the kosher salt and water. Whisk together until the salt is dissolved.
Add the pickle spears to the water. Let the spear soak in the salt water for 2 hours.
Drain and discard the salt water.
In a nonreactive pot, combine the vinegars, water, sugar, and salt. Cover, bring to a simmer until the salt and sugar is dissolved. Remove from heat and set aside. Allow the brine to cool completely.
In the bottom of a quart mason jar, add 1 teaspoon of dill seed, 1/2 teaspoon of pickling spices, and 1 teaspoon of minced garlic and 1 teaspoon dried minced onion.
Fill jars with cucumber slices.
Using a funnel, carefully pour the vinegar mixture over the cucumber spears, leaving 1/2-inch of room between the pickles and to top of the jar. Wipe rims with a clean damp rag or paper towel. Place a lid on each jar and secure tightly.
Allow jars to set for 3 weeks before opening.
Jars will last for up to three months in the refrigerator. Pickles can also be preserved using the water bath canning method. Properly canned pickles should be stored in a cool dry place and are good for up to one year.