I often hear from new ES owners that did not have the jack adapter, PN 3458, and I was unable to secure any. I was able to find a manufacturer to make them from a 3D scan. The original ones seemed to be aluminum, but these are steel. I am going to make a group order NLT April 10th, 2024. If you would like one, let me know (edit: use email or PM links in profile) and I will add you to the list. The turnaround was 3 weeks. They are $200 each.