Important Note: This item is not returnable. Though built to precise and exacting specifications, it is possible this outer slide may not mate perfectly with your existing inner slide. The 50 series has been in production for decades, and the possibility exists that a new outer slide might not immediately make a perfect fit with an older inner slide set. Accordingly, this slide may need to be matched to your inner slide set by a qualified technician experienced in the art of slide alignment and action. This process might be costly or time consuming, and may involve altering your new outer slide.