These are transmission cooler line fittings for 1996 - 08. 4L80-E/4L85-E transmissions. Will allow for the connection of a -6AN size fitting. Includes 2 fittings, one for the front cooler line and one for the rear cooler line fitting. This kit only fits 4L80-E & 4L85-E transmissions from 1996+. The rear cooler line is a special fitting and must be used with the lube tube to avoid transmission damage. Fits most 1996 - 2008 cases with 1/4 NSPT threads. 9/16-18 thread for 2009 - Up also available. To determine which you need, remove the stock adapters and measure the diameter of the threads. If measurement is 0.5568" they are 9/16 - 18. If they measure 0.521", the 1/4 NSPT option, which is the most popular, is required. O-rings included. Made of aluminum and may be anodized. This Item Ships for FREE in the USA.