Floor mat retainer

[Tony clc#24130]

I recently bought a 1987 Brougham with 77,000 miles on it. It's a nice car and it has the original carpeted floor mats that have sewn in loops on the rear edges. These loops clip onto a plastic grid work that has little spikes on them to grip to the under side of the mat and the carpet beneath. I am looking for a set (2) of those grids in gray. Iv'e never seen these before but the mats are the originals.