OEM plastic caps will necessarily be 45 years old, will be brittle and are available on many 'other' cars in breakers yards. If you buy something else, caps are often free. Our car came with black/gray ATS caps in 1980 and when one split, I replaced it with an aluminum one from Pegasus Auto Racing in WI, USA. The caps are pretty much universal- the aluminum caps also fits Girling clutch masters.
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