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This is a direct replacement to the rear uprights on the Vanquish and Egress. They are usually found on the C tree. The C-Tree is made from a very hard and inflexible plastic that is prone to cracking with age due to the stresses applied by inserting the machine shoulder screws. This nylon is much more resilient and also comes in a variety of colors. One order comes with two uprights. Please see the video below.