Sheared dog bone mount bolt - What now?

[JackD]

What size bolts do I need? Where's best place to get a new one? Am I going to be able to this weekend or am I stuck until Monday?

 

[welshname]

Which bolt have you sheared as they are both different

 

[JackD]

Front one

 

[Budgie]

It's the main 18mm headed one by the picture Jack sent me...

 

[JackD]

Is this definitely 10x70? Unless the part I have is wrong it's too small?