I got some interior panels from LROR a while back, they came with a full mounting kit but I destroyed a couple of these rubber t-nut thingys and need to track down a few more:

Can anyone fill me in with the technical/trade name of these nuts is?
PS - I have contacted LROR about a few spares but they'd have to order from their supplier and it will take time - so I might try and find them locally first.