SHS = Square Hollow Section
RHS = Rectangular Hollow Section
while a square is a rectangle, they are different, where a square is a rectangle with all four sides equal.
The standard battery has a tube that vents from the battery out through a grommet in the boot outside the car.
you need this.
OR
a sealed battery (like a calcium one)
OR
a box that is vented
Its the fact of the cars not selling but more so that the floor stock is leased and the financing on these leases has been pulled.
no one can afford to buy that many cars and just have them sitting there doing nothing.