The holes have 76mm centers, which is 3 inches, so I'm guessing they're about 4 inches long overall, and about 3/4 or 7/8 inches wide. A short length of 1/2" copper tubing can be easily hammered flat, and will be close to 3/4" wide. Cut to length and drill holes as you need them and you have a one piece connection strap.
Google: make battery connector from copper tubing
Google: make battery connector from copper tubing
