A straightener or guide frame for motor vehicles, with the frame including longitudinal support members connected by transverse support members. The longitudinal support members are provided with mounting or attachment holes spaced at given intervals for enabling an attachment of cross support members or intermediate supports which, in turn, carry the cross members. The cross support members are adapted to support adapting elements which are aligned with points of attachment of the motor vehicle. The intermediate support members are provided with holes which correspond to the attachment or mounting holes of the longitudinal support members as well as additional holes arranged to form a grid for enabling an attachment of the cross support members. The attachment or mounting holes of the longitudinal support members are arranged along at least one lateral side of the longitudinal support members and the holes of each of the intermediate support members corresponding to the attachment or mounting holes of the longitudinal support members are disposed in a plane that extends at an oblique angle with respect to the holes or openings forming the grid.
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