I'm hopefully soon going to be replacing the standard CD/Radio in my Octy vRS with an RNS510. On the various threads I've read on this I'm told I will need to purchase a new surround (although I assumed the RNS510 was physically the same size, so could use the existing surround?). Anyway - I've got a list of about 6 different part numbers so I'm totally unsure which one I want - so now I'm asking and I'm including pictures Here is my radio in my car: The "Stream MP3" will be coming out.