10 Pair D-Shape Screw-on or Click-on Silicone Nose Pads 15 mm (10 PAIR, D SHAPE 15MM SCREW ON) from Group Medical Supply
I recently scavenged a pair of these nose pieces from another pair of glasses and this order of, 10 Pair D-Shape Screw-on or Click-on Silicone Nose Pads 15 mm (10 PAIR, D SHAPE 15MM SCREW ON) was placed just after the change out.  These are soft, but still firm and will first be used to replace the scavenged pair and then be a reserve for future nose piece problems.  I anticipate it to happen, as my daughters parrots have chewed two off now.  I'm ready for the next assault.