Cable drag chain

[birchy]

I'm building a flat screen monitor into a sliding drawer, so need to run the cables through a drag chain. I've not used drag chain before - will I have to buy a size big enough to feed the VGA plug through, or does the chain come apart so I can lay the cable inside first? I only need something like a 10mm x 15mm chain for the cables but will need to go to 15mm x 38mm if the plug has to be fed through. The problem is that I only have approx 40mm space and a 15mm x 38mm will be something like 50mm external which will be too big.

EDIT: This is what I'm looking at: www.ebay.co.uk/itm/290822614455