Aluminum Extrusions for Spoilboard

Does anyone know what are the widest aluminum extrusions available and where to get them? I want to replace my MDF Spoilboard with aluminum extrusions and MDF sections but have only seen them 375 in width. I wanted to know if anyone has seen wider extrusions on the market. Thanks everyone for your help.

600mm?
https://www.isel-us.com/aluminum-extrusion-t-slot-table-plate/pr-30

Misumi has 1000 mm by 250 mm so with four of these you can cover your 1000x1000 x carve.

https://us.misumi-ec.com/vona2/detail/110302261820/