I believe these are the right ones. The centre cap is actually the same as the centre cap on the 67-69 Beaumont rally wheel. 

Canadian Poncho wrote:

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A bit off topic but aren't the turn signals clear in '68?

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 I believe 1968 was the transition year for white to amber turn signals.

 "1968 marked another change:

Federal Motor Vehicle Safety Standard 108 required amber

(rather than the earlier white) lens front turn signals;

rear signals could be red or amber.

Note: It was also in the sixties that 4-way hazard flashers were first required".

Often seen with a nice Full Wheel Cover. (likely standard on SD396 and parking lenses do look clear in this 1968 rendering) 

Cdncarguy wrote:

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That's great thank you, i know its prob a long shot but would anybody know of those wire wheel covers for sale I want to bring my 68 sd back to as original as possible, it is a numbers matching 396 auto with white bucket interior i live in southern ontario any info would b greatly appreciated , thanks

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 I have 4 you can have, they are used and are over 50 years old. 14" though. PM me details. 

I'll have to see if I can find my old photos, but I'm pretty sure that the '68 I had in 1980 had amber lenses.