Speaking to my guy at Eden, he’s contacted direct and they’re a made to order product apparently, quote on request and he reckoned quite pricey…
Also, might be other options, but Cornish list them as 2000x600 - there’s no way they’d be getting to where I need them at that size and weight!
Let us know how you get in though, every chance i won’t have started the room in question still…!