I have the welded seat brackets as seen in this picture:

Unfortunately I do not have any pictures of the correct seat. I notice that there is a far larger gap where the seat bolts into the bracket, whereas on the later type bolt on brackets there is a very slim width.
Has anybody got any pictures of the correct seat frame - especially good if anybody can provide pictures of Van seats.
I have a 1960 Van which is going to have a complete show restoration, any help would be greatly appreciated!