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You've answered your own question there. The probability of finding spare parts from 30 years ago is pretty slim.
If you mean cage where you wrote race, then it's fine as a second best option to run that BB with loose balls, so just get some good quality steel balls from your favourite bearing shop. There's a German ebay seller with NOS caged balls for about £40, my German isn't up to knowing whether that's per side or per set.
where can i find a 1/4 x 11 dura ace bearing race and bearings ?
from a da 7400 bottom bracket