I think they would have been fitted by the Toyota Dealer in Perth (Garden City Toyota - 164 Leach Hwy, Melville ..... I wonder if they still exist?) that first sold the vehicle back in early 1980. (Probably done to try and boost sales.)
No. I wasn't running radial tyres at that stage (and I don't think they were even available in 16 inch sizes back then). Those tyres would have been 7.50x16 6-ply (or perhaps even 8-ply) - Cheers
