I took old and new trunnions and put them together.. The trunnions I bought from Bullmotif (same as esm model I asked both) are 6cm in height (the metal casing that is) the ones on the car are made by a company called Allena and they are 6.5 cm long..
I have no idea why that would be the case!
apparently according to allen from morris minor centre there are different brands of trunnions? how confusing! i just bought mine from bullmotif you'd think they're all the same but no!
NEW TRUNNIONS 6cm - TOO SHORT

OLD TRUNNION - 6.5cm
I found on the weekend when trying to do a trunnion swap that the new bottom trunnions I bought were about 0.5 cm short
Thanks,
Tom