Your '68 model probably came with the real early type mirrors (see pic). These are NLA, but if you find any the mirror will fit either left or right side (not handed).
Normally, cars were delivered with only a driver's side mirror, unless a passenger side was ordered specially.
The trapazoid shape mirrors were used on later models and are now available again from BMW, and would not look out of place, like the '74-'76 flag mirrors.
_________________
Les
'74 '02 - Jade Touring (RHD)
'76 '02 - Da Beater (ex Delk's)
'76 '02 - Dark Met Blue (running project)
'76 '02 - Sienna (sleeping project)
'76 '02 - Sahara (parts car)
'98 323i Conv - Black

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