After market for sure. There was no Chevy option for those. It could have been a dealer install since they were pretty popular at the time. I built several for friends and installed them. If it was a dealer install you should keep it for a restoration.
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'68 C20 Longhorn 50th Anniversary 400/TH400
'68 C20 Longhorn 50th Anniversary 468/TH400w/buckets
'72 C20 Halfhorn (Longhorn w/o cab and front clip)
'69 Flxible Cruiser (look up ugly in the dictionary)
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