I think...the rules apply due to the rear mount location of the battery in the rules. That would be the closest point to the trunk mounted battery. How ever, VW, and a few other vehicles had under the seat mounted batteries...

Also in those rules for racing, they say you must also have a manual ignition off switch too, besides the disconnect switch. The disconnect switch in that case is for the track members to be able to disconnect power in case something goes way wrong...

That's in case any Hot wires are pinched, causing a short, and spark if fuel is leaking.
I believe this was somewhere around 2015, Rick, Rosie and Johnboy
John Norton aka johnboy