Its 270 x370 x 5mm Alu. plate . Inverter mounter on the this on the RHS , top view . I have cut an arc on the LHS so it is easy to keep the existing cables intact when you remove the seat base. I just need to remove the captive fuse holder bolts and the base just slides out . Keeps original OEM wiring looms intact and you don't need to keep disconnecting the fuse holders. Will send through a photo as soon as possible. I will use the seat base top rail that has some M6 size holes in , with some angle brackets and put two 12mm ply dividers across and a couple of angle brackets to mount to the base. Cut an arc out of the ply dividers for the Inverter as it is mounted on the base and cable glands are drilled through the plate to get the vertical cable access for the solar and DC charger to keep the wiring simple . 2 dividers allows the solar mppt, dc -dc charger and a isolator all fixed vertically through the ply. This maximises the remaining volume , gives a solid plate for fixing through and a 20mm air gap under the plate also giving easy access for the new cables.