Thanks for the offer Kat, got here a bit late but it wouldn't have mattered anyway as I'm after the driver's front. FWIW, there's no part number printed on the underside of the covers, just their position (LF-FR = Left Front, RT-FR = Right Front, LF-RR = Left Rear, RT-RR = Right Rear).
Btw, interesting that the previous owner modded the cover by cutting away the entire back section (minus the tabbed corners). I would think that would make it more likely to pop off over time than if you just cut away the top.