Underfloor Soundproofing

Hi, I'm looking for the underfloor soundproofing that is sandwiched between the top of the gearbox and the floor, for my Discovery 11 TD5 with manual gearbox. Just bought one that had a clutch fitted approx. 1 year ago and whoever did it left the soundproofing off when refitting the gearbox.

I've got a box of black adhesive sound proofing pads if they're any use, was gonna use them in my series but didn't in the end

They're about 25x45cm I think