Tim Mitchell wrote:
In article . com, David
P writes
The Ikea ones fit inside a 50mm carcase, or 100mm carcase (minus the
18mm each side)

I presume you mean 500mm or 1000mm (as 50mm, minus 2x18mm, is quite
narrow).
My problem with Ikea is it's a 2 hour round trip from here, with no way
to check if they actually have what you want in stock.

Their website allows real-time stock checking although admittedly I
wouldn't trust it if it listed only a couple of items remaining.