For economical restoration, the complete hinge mounting plate is also available in B quality. Not only is the metal thinner, but also the fit on the bottom part is less precise. You'll have to work longer to get this part to fit properly. The length is a fraction less than grade A, i.e. 24.5 cm. If you still want to mount a higher quality or if you are only looking for an outer sheet (instead of a complete corner), look at the A-quality listed under the "alternatives" tab.
Caution: As with quality A, the interior is welded on one side only, make sure that you also weld the other side during welding, otherwise you may have problems fixing the door later.
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