Craftsman 86, there should be a date code stamped somewhere on the chrome shaft of that driver.
One number and it will tell us the year of mfgr.
That then will narrow down what year it was made and thus ID your red.
If that's what SO sent you you have to go used cap or black is my guess.
Only workaround is if you have a snap-on driver that may have NOS caps or know the super secret subfix for the part No. for that particular S-O offering that then has a secret S-O source for the cap. I've seen that happen.
That's the challenge when dealing with the special offerings or oddball S-O ratcheting screwdrivers when repairs are necessary.
Aside from jeffmoss26, member gj67stang is a guru when it somes to knowing all things snap on ratcheting screwdrivers btw. Might want to PM him too.
And then there is canukian.
Good luck.