Split bus part identification

The linkage on my 65 splitty gave way this afternoon in Haberfield, so I coasted to the side of the road thinking my accelerator cable had snapped.

I was lucky since it was a small pin that had worked its way out on the linkage.

I need some help working out what the pin is called. If you look at it end on, its in the shape of a pac man, and it is a spring fit through the linkage.

i have a bolt in there, but I fear it may fall out.

Any ideas what they are called? and where to get them?

Thanks

Steve