an e-mail to Wayne may also bring the answer...I've not seen the Griffin performance but at
www.Lightfoot.ca the Parks appearance is mention (below) ...he's likely using the same guitar and pickup that was used for the studio session solos:
THE MERV GRIFFIN SHOW - SYN - 1982
Lightfoot performs Baby Step Back, Blackberry Wine and a medley of Beautiful and If You Could Read My Mind. Interestingly, Dean Parks sat in on lead electric guitar, with Terry handling the chores on acoustic for Baby Step Back.