To add a note to what mrennie said.
When you stand it on the floor you have to use a 2x4 or something under the bottom rail, there is a lip on it that prevents it from standing up. See photo. Photo shows a repop .. if this was an OEM piece it would not be standing straight up like that.
Note the metal blocks I have underneath to support it by the bottom rail without the lip interfering.
It's a hard situation to describe with words. That bottom rail has to be parallel with the ground to sit flat on top of the frame mounting bushings, but the support should tilt forward 9-10 degrees, the lower radiator mounts that attach to this bottom rail are tilted to the back to position the radiator straight up and down, the repops have the bottom rail parallel to the top ... so when you tilt the support forward 9-10 degrees it does not sit on the frame bushings flat like it should. If you force it ... it raises up the whole support which raises up all the sheet metal attached to it. I think some people do this, and then just crank down on the frame mounts so much it pulls it back down, which makes for another bunch of issues.