Traxxas stampede battery hold 8-cell (or fewer)

This is a piece that is large enough to hold an 8 cell battery in the Traxxas Stapede 4wd model. it will also hold a 7 cell or 6 cell since they are smaller. The standard tie down (below) only has a hole big enough for a 7 cell.

It replaces a part like this:
https://www.amazon.com/Traxxas-6727-Battery-Hold-Down/dp/B004ED9ANW

Feel free to let me know if you have suggestions, I might be able to help.

Credit: thanks to asciencepotato for his submission so I didn't have to get out my calipers. His only allows 7 cells, btw.