Have you tried the 4th gen parts books in sticky threads of 4th gen section, for the parts number.
shbox.com has a bunch of part #'s also.
If GM doesn't have the switch try your local auto parts store.
According to 94 service manual, the brake switch that controls tcc is same one used for brake lights.
Found the # it's 10194425 Unfortunately it appears to have been discontinued by GM. Might find one on ebay, or amazon.
But never fear, autozone has the switch. Since it has 6 terminals, I believe it might be the correct part. And only $8.99