Before ordering parts please determine which UPLIFT Desk Frame you own. Take a look at the left or right side of your frame, if you DON'T see the UPLIFT Desk logo near the top of the frame, then it is a V1 frame. If you DO see a logo, you have either a V2 or V2-Commercial Frame. The V2 frame DOES NOT have a lower-crossbar that spans between the legs at about knee height. The V2-Commercial frame DOES have a lower-crossbar that connects the legs together at knee height.