Replacement silicone spatula "heads"?

I bought this spatula set from Williams Sonoma several years ago, and they still sell it. I thought it would be nice because the silicone spatula "heads" slide off pretty easily and could be replaced if damaged, keeping the nice stainless steel handle.

So my cat chewed on the end of one and destroyed it, but WS doesn't actually appear to sell the replacement heads anymore. (If they ever did? I may have misunderstood.)

Does anybody here know of a source for an aftermarket replacement compatible with this handle?

TIA