Hi Koala

#54 is American rider Beno Rodi on a 500 BSA Gold Star (he approached me once for a picture i took at Jurby Roads in 1984!)

#62 is a 350 Bultaco. I think there was only one in the race, which would make it Geoff Tunstall. The leathers look right for him.

#69 I'm fairly sure this is Mac McDiarmid, who I believe was editor of Bike Magazine around that time. Leathers & lid look right. the bike would be a 250 Suzuki T20.

I haven't figured out #72 yet. It looks like a Yamaha. There isn't one noted in the results but amongst the retirements is Jim Wells, bike unknown. Could it be him?