Fuel Tank sender union size?

Hello as per title, i was wondering if any one knows the size of the female unions that are on the petrol tank fuel level sender? been supplied a new sender unit without them.
its an 8mm olive used.
I cannot use the old ones. Different plumbers merchants and Pirtek etc do not do them...
so its an online search now.
Many thanks.
Hi Colin.
I've got the olives its the nuts/unions i need the sizes of as i cannot transfer them across from the old unit.