How to install crossbar on plastic floor?

1, the method of installing the cross bar on the plastic drawing, add a pair of extension screws, and raise the fixed position of the cross bar to the shell.

2. A method for installing a crossbar on a plastic map, wherein a first crossbar, a second crossbar, a first vertical rod and a second vertical rod are fixed on a bracket body, and the bracket body, the first crossbar and the second crossbar.