I attached the photo for clarity on the ones that work for me, but go with the one suggested by phrunt if you prefer. The important part from my earlier post was to select 'Model A' on the link I provided, it has the master/slave jumper. 'Model B does not, and model B is the first photo that shows when you click on the link. I suspect it's my Scottish heritage that leads me to the lower priced one...
Anyhow, I have a stack of 3 of the ones in the photo and they all tested as working. I went through my orders history for the link. I'm fairly certain on this. However, I don't have a link to the same product on Amazon as I didn't place my order with them.