What you bought now is a 30-fold slide, but the original one is a 20-fold slide?
There is a black claw on the side of the three-fold slide. Press the claw down and you can pull it out for installation, but Anfa is different from its original position and needs to be familiar with it. This kind of slide has good performance and stability, but you'd better change it into two pieces with the same length as the original (length specification: 25.30.35.40.45.50 cm, etc. ) the quality is better, and then you can screw a few screws yourself. ?
Note: Double-folded slide rails are divided into ball and roller. You should buy a roller.