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Howard-
That appears to be a solution. You can buy them from eBay.
https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F232112604703@sconkers I have a similar age frame that is dead, I'll see if I can get them off for you without ruining them.
Matisse
Thanks everyone for your help. Yes there are just holes in the frame @Matisse
So if I got something like this: https://www.charliethebikemonger.com/sunrace-downtube-coversadjusters-to-fit-downtube-shifter-bosses-integral-adjusters-4501-p.asp
Then how would I mount them onto the frame ?