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They're C-Products "Tactipul" floorplates. I use them on all my FS2000 LAR magazines. I bought mine from Questar but it looks like they're not carried there any more. I guess Marstar is the place then.
I have 3 or 4 gently used ones that I could sell. They are just sitting in a parts box. Send me a PM with your email and I will send you pics if you like.
I also have some Magpul ones, brown, not so gently used