I was wondering if anyone had this unit because I just sold mine today and the guy I sold it to is asking me about the 2nd locking piece. I gave him the metal casing that surround the unit and the locking piece on the left. I really don't rember there being 2 locking pieces, so I just wanted to make sure. The metal housing is required for domestic cars and supposidely for older Japanese cars like 89 accords? He says he needs the other locking piece so he can just slide the unit in and have it lock? He also told me that they don't make any single-din mounting kits for 89 accords but I have no idea. Can someone help me out? Thanks.