Dry Brake Lever Hoods

I'm not sure if this belongs here or in Classic & Vintage, but I have a Suntour Superbe Pro brake set from about 1990 or so. The hoods are starting to dry up. Any advice for restoring them? I have some silicone grease (Shin-Etsu) that I use for the window seals on my car, but I'm not sure if that would restore drying hoods. Perhaps some 303 protectant? I'd really appreciate any advice.

Thanks in advance.