I have installed at least three of the dual CE NVRams from http://nvram.weebly.com
In BH and Panthera games so it will work fine for a HH. The 5101is not in a socket and it's 22 pins. The boards are fairly fragile so be careful when installing socket.
I just plug Andrew usually as I know his work and he was one of the first to drive the price to a better place. I am sure that other product will work too.