UPDATE: Mark found this photo which seems like it could have been taken at the same time the video was shot: https://www.morrisonhotelgallery.com/photographs/T9XmZX/Neil-Young-Broken-Arrow-Ranch-1971

Mike spotted this video of Neil Young driving his 1951 Jeepster. Unfortunately, I cannot embed the video, so a screenshot will have to make do. You can see the video snippet of the Jeepster at the start of a video with Neil Young playing “Old Man”. It appears the old man rancher that inspired the song can also be seen.

I believe this is the same Jeepster that Vernon (and his aliases) have mentioned over the years. Neil’s Jeepster has the Lightning (inline 6) engine. It also has the JEEP brass tag and a 673 has the emblem, plug Vernon’s overdrive solenoid.

Per Vernon, “noted rock star NEIL YOUNG opted for the 51 — in 69 he drove it from LA to his new ranch in LA HONDA , guitars in the back , gold records , the TURTLES drummer JOHNNY BARBATA rode shotgun — he had to get out of LA and hide in the wilderness , people were picking him apart”
… and …
“NEIL YOUNG wont drive his fossil fueled classic cars anymore — he’s went utterly , completely GREEN ( listen to his GREENDALE album ) — his 1951 WILLYS OVERLAND JEEPSTER PHAETON is now a ” museum piece ” gathering dust”.

Neil Young in his 1951 Jeepster. Standing next to it looks like David Crosby to me.