Spae Wheel Holder Problem

I can't work out how to attach the spare wheel???

I assumed it would just bolt on, but I've tried it and it doesn't. There's a picture below so you can see what type of carrier I have.

 

 

This is a picture of the wheel attached before I started restoration

Looking at photos I have which the spare wheel is in, there seems to be some kind of bracket at the top, thing is, I don't have any bits left over? Anyone got any ideas?