I am working a little on the firewall forward kit tonight. The WH-P25 that connects the battery negative terminal to the firewall has the tabs installed at 90 degrees apart. It seems to me that there are two options based on the clocking of the tabs.
1. Allow the ground strap to twist 180 degrees between the firewall and the battery
2. Bend the firewall-side tab of the strap away from the strap so that it can be bolted to the firewall flipped from how it would have to be bolted on with no bending