HiAgain, a bit more searching and I found the exact answer I was looking for.
Re: 67 & 68 BumbleBee Stripe
« Reply #2 on: 27 March 2010, 03:04:55 »
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Early 1968 production used the 1967 "Bumble Bee" stripe (RPO D91). Then, staring the first week of January, 1968, they went to the "Hockey Stripes" (RPO D90). The D91 "Bumble Bee" stripe continued as an RPO on all cars EXCEPT SS for the duration of the 1968 model year.