Graeme Lawrence T332 drawing

[faminz]

Hi,
Im an infrequent visitor here but I wonder if anyone can recognise the chaps behind the car in this drawing for me?
I have recently completed it using a black and white photo I took myself at Manfeild in the 70's. Graeme had just come off the track and was pushing the car across the gravel track back to the stables/pits!
Its been suggested that the chap on the left is Ulf Norinder and the wild haired bloke immediately above Graeme is Graham Addis? Im interested in identifying them as part of the caption for the prints I sell. Hoping you can help.