Low Profile PCIe card in a standard ATX case - will it fit, and do I need adapters?

I've got a standard normal-sized ATX case (don't know its name or specifications, because I got it from a friend) and a standard motherboard (MSI B150 PC-Mate) inside.

Since it doesn't come with a WLAN card, which I need, I was planning on using it with a PCIe WLAN adapter, which has a low profile bracket:

Now if I look into my case, it looks like there will be a gap on the backside where the card is gonna be, since it is obviously shorter than the other components and the case. I was wondering if there are good ways to circumvent this, as it seems to me like it could decrease the card's stability inside the case.

I found the above picture on wikipedia, which looks exactly like what I need - but even extensive googl'ing for things such as "low profile pci bracket" etc. didn't yield results.

I guess my question is: do I really need an extension/adapter bracket, or is there another way to properly install the card? And if not, what is that extension thing called, so I can at least know what to shop for.

Thanks for tips, or recommendations :)

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