Looking at a 68 GTS.......
You can see the basic layout at
http://www.hamtramck-historical.com/images/TSBs/1968/D68-25-1 page5.jpg
In addition to that though, you also need to know what the sales codes are.
I can read '69 up tags like a well written page.
1968 back tags give me a headache.
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