Universal Inside Link Plate For 4K Weight Distribution Hitch (90-02-5200) by Equal-i-zer®. The portion of the sway bracket that is installed on the inside of the trailer frame. For 4K Hitch. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind. It will meet your needs and deliver great quality at an affordable cost.