Koosh, why don't you just cut a piece of sheet metal to put there?
My 71 Runner came with a sheet metal divider because in it's previous life it was a drag car & it had a trunk mounted battery.
Rules said that a metal divider has to be between the driver and battery.
Should be easier to install that the original divider....no?
View attachment 1833727View attachment 1833728
In the second photo you can just see the roll cage stubs where they meet the trunk floor. I got the car with no cage in it and those little stubs were easier to leave alone than try to remove them.