Firestik has discontiniued this item.  If we are out of stock, please consider the AUSS3H

You might also consider the following option:  SS34H with the S1B

 Firestik heavy duty springs are designed to be used with antennas up to 5 feet tall. For 2 foot FS and KW antennas and 3 foot Firefly and Road Pal antennas, use a medium duty spring. These springs are made from long lasting, top grade electro-polished stainless steel. The upper and lower inserts are made of chrome-plated machine brass and have standard 3/8"-24 threads to fit all 3/8" x 24 threaded CB antennas. Each spring is about 3.0" (76mm) tall with a diameter of 0.800" (20mm).

• Top Grade Electro-Polished Stainless Steel
• Inserts Made of Chrome Plated Machine Brass
• Standard 3/8" X 24 Threads
• Good for Antennas to 60"
• Spring Dimensions 3" Diameter 0.8"
• 2 Year Limited Warranty

You can find more information on CB antenna springs here.