The Mag 515 remote works on my 2160 and my recently acquired ZV457MG9 combo vhs/dvd unit. It probably will work your ZV450MW8A as well.
Also, I tried a Logitech Harmony 300i from Walmart, and it worked both my Mags. I chose the 515 over it due to the 300i's inability to work a crucial function on the ZV457MG9, setting the Timer Set function needed after setting up a Timer Record. The zv457 didn't come with the original remote, and though the Logitech can be programmed to operate functions that aren't included in the software download (this remote retrieves the codes via the internet with an enclosed USB cable), not having the original meant I couldn't set it to work that function.
The price is in the $26-29 dollar range at Wallyworld.
Dazed and confused over high tech.
Sigh...Concrap. The Internet Overlord Cometh
They're not com-tastic!