Some users have recently had their accounts hijacked. It seems that the now defunct EVGA forums might have compromised your password there and seems many are using the same PW here. We would suggest you UPDATE YOUR PASSWORD and TURN ON 2FA for your account here to further secure it. None of the compromised accounts had 2FA turned on.
Once you have enabled 2FA, your account will be updated soon to show a badge, letting other members know that you use 2FA to protect your account. This should be beneficial for everyone that uses FSFT.
Why not just get a piece of 1/8" steel or aluminum (whichever type your case is) and cut it to fit? You could probably buy a jigsaw for nearly the same cost as buying the plate, as it's probably a custom order thing.
Or just cut up a sidepanel from a derelict case... Maybe the remnants after cutting out a window?