These are the exact dimensions. 3 bays 75cm deep (attached together in photo). 2 of those are 152 cm wide, the 3rd is 122 cm wide.
Wooden shelves are 5 of each size, so you can use extra one to cover the gap for the shorter one (see top left shelf pictured). 4th bay (corner only seen in first photo) is 90 cm/deep and 180 cm/wide. Uprights - 4 x 230 cm, 4 x 244 cm and 4 x 304 cm. (It is possible to cut them to size).
They are, however, in used condition and a few of them a little bit rusty at the top (see picture), possibly some of the joints as well. (might have to force them into place). They will also have to be collected, so make sure they fit in your van/truck. The item "4 x Large Heavy Duty Industrial Storage Shelving Bays Racking see description" is in sale since Sunday, March 1, 2020. This item is in the category "Business, Office & Industrial\Retail & Shop Fitting\Shelving & Racking".
The seller is "kayagent" and is located in Hednesford. This item can't be shipped, the buyer must pick up the item.