Bad manufacturing of brackets. The holes on top and bottom did not line up with they had to be drilled to correspond. Same with the front bar AND roller bar connectors, all had to be re drilled for the holes to correspond. Also the holes on the connectors did not match with those of the roller. Reached out to Aleko and rep promised to send out new connectors relating that the ones I got were defective (after sending him the pictures). Never got the replacements nor is he responding to my emails. Buyer beware. The instructions are not very precise and as many customers pointed out in reviews this product is not worth the price paid and customer service is terrible.