Stupidly impossible storage box hunt can anyone help please?

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I have a unit that I would like to put some storage boxes onto and despite looking everywhere including 2 hours trawling around Ikea today I cannot find any boxes which will fit. Well that's a lie I found 1 wooden box which could work but I'm worried that would scratch the unit when being removed.

The dimensions I'm working with are:

No more than 25cm high
Up to 45cm long

The width of the space on the unit for the boxes is 74cms

I don't mind if they are narrow and I have to have several to fill the space but it seems to be the combination of the height and length that is posing a problem.

Ideally I would like them to be grey but I'm beginning to wonder if any such boxes exist. Does anyone have any amazing suggestions of what might work or where else I could try looking.

[GreenTulips]

www.argos.co.uk/product/3439331

[HopHoppityHop]

I've emailed before (rotho) and asked which products would fit the dimensions. They were very helpful!

[CatToddlerUprising]

Argos have quite a few within that size- just type in canvas boxes

[CatToddlerUprising]

Sorry, I read 28 as 25!

[Lwmommy]

https://www.amazon.co.uk/Storage-MANGATA-Folding-Thickened-Washable/dp/B07C5NYPVQ/ref=ascdff_B07C5NYPVQ/?tag=googshopuk-21&linkCode=df0&hvadid=344405143865&hvpos=1o1&hvnetw=g&hvrand=1126949082088914857&hvpone=&hvptwo=&hvqmt=&hvdev=t&hvdvcmdl=&hvlocint=&hvlocphy=1006867&hvtargid=pla-525801820223&psc=1

[reefedsail]

If you are not bothered how they look I'd have thought The Plastic Box Shop would sort you out.

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Thank you so much for all your help!

Lwmommy that one looked great and just underneath it was a set of 3:

MANGATA 18" Thickened Storage Boxes, Extra Large Fabric Baskets, 3 Pack (Grey, Jumbo)

Which are pretty much the perfect size at (45L35W24H)!

They hopefully should fit perfectly on the unit. I really should have known better and asked here first before wasting so much of my day trugging around in the rain.