FYI the hole-to-hole spacing is 75mm. That leaves a pretty good amount of space between 66mm cells. I had to drill and tap balance wire holes. I also lightly sanded the surfaces to remove the oxygen layer on the aluminum and added carbon paste to keep it away and keep things conductive. I had used copper busbars in the past, but Al is 60% as conductive, 30% as heavy. I I like these and may use Al more in future builds.

It's good for the price. Then you can get different positive & negative end pieces from somewhere else. It comes with some. It's just flat stock with a fee more holes in it.