Corsair 570x PCI back plates?

My friend is looking to sell me his 570x case for my black friday build and he might not have all the PCI rear plates. I definitely want to make sure I have a good seal from dust in the rear so I'm looking on Corsair's shop to see if they sell any. I see some for other cases but are the plates from those the same as the 570x? If there are any experts that can chime in this niche detail, that'd be great.

If you have enough filtered intakes, then I wouldn't worry about it. A lot of the times you can use a PCIe slot cover from a different system. Are you using a discrete GPU or using the integrated GPU? In most cases two are removed for a GPU. People seldom use any other slots.