FOUND IT GREG!! Here's the link to post 3367 (72 C20 Custom D Custom Camper)
https://sacramento.craigslist.org/ct...336827970.html
68 K20 long step. Little skeptical on the SPID, but if a repro, I am willing to bet it's just a repro of the original (i.e. seller didn't make it into a 68 Cheyenne Super...) 21.5K
https://pittsburgh.craigslist.org/ct...371503895.html