Protective cover for an older iPad

I'm looking for a protective cover for an older iPad. My iPad is approximately 9.5" high x approximately 7.25" wide These dimensions don't seem to fit any of the current iPad or iPad Pro profiles. I've also noticed that when I look under Settings / General / About / Model all I can get is MD510LL/A but can't toggle to the Axxxx portion of the model number. It seems that when I look for iPad covers online they are more defined by the Axxxx model number.

S/N of the iPad is DM***182.

Thanks in advance for any help / direction that can be offered by the Community.

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