68 cst questions

[75gmc454]

Looked at a 68 cst 396 a few days ago. I have some questions about some of the options, so I came to the experts.

The cab has the removeable hump, the guy said that big block trucks had that. Is that right?
The cab has roof marker lamps. Were they available in 68? The option sticker just says marker lamps, I cannot remember the option number.

The vin number on the option sticker is printed in darker ink than the rest of the letters on the sticker. Was that common? This is the second truck I have seen like that, and I was wondering if anyone else has looked at a sticker with the vin printed darker.

The truck has bucket seats with the small middle seat. What kind of brackets did those seats have? It looked like all three seats were mounted on a single bracket, but I did not look that close. What is correct?

The truck is a swb cst, fleetside with wood floor, buckets, tach, and 396.