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Yes you would need a pair of them, just search ebay for downtube cable adjusters, shimano or campag ones will fit.
The bit that is missing from your frame I'm not sure what the correct name is, but found this on a quick google search http://community.vintagecannondale.com/threads/barrel-adjuster-bracket.116/
May be difficult to track one down so good luck.
krankers
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 ?