BeTePok, Sorry to hear of your misfortune. I have replaced that top piece on my own 505 after a mishap. Following the diagrams and instructions in the repair manual, it was one of the easiest fixes I have attempted. There is very little disassembly to remove that part.
You can order a new one at:
https://servicesales.sel.sony.com/ec.../web/index.jsp. Enter part number A1362416A in the search box, and select Part Number from the drop down box next to it. The cost is $36 plus tax/shipping. The website indicates the part is in stock.
Hopefully this will put you back as good as new!