Thanks Lyn,
I don't know the "series" of our truck but the data plate says it is a 1945 model and the attached two photos show it before we dismantled it. I think the engine number might also be relevant but its away being reconditioned at present.
And thanks also David,
I had to chuckle at your comment, as I also sometimes confidently make definitive statements which are subsequently proved wrong

But in this case, I think you are correct and we will probably use the spring type of mount. As stated before, we do have a set of those mounts here, but don't have the springs or special bolts to go with them. Can anyone provide a photo of them?
Cheers,
Andrew