Yes. The part number for the silicone septa (Suba-Seals) in the white PTFE Carousel caps is RR98076 for a pack of 100.
These are considered consumable items as they are likely to deteriorate over time with normal use, e.g. due to piercing the septa with a syringe for additions.
Suba-Seals are available in Viton if preferred; the part number is RR98176 for a pack of 100.