Has anyone got a link where I can get the correct springs from or the exact make of spring needed so I can search the internet or some? Cheers

16x44 extra heavy duty die springs. No link needed, it's all there in the boot opening thread.

 

This will only work on estate cars and only 100% in warm weather, otherwise it just pops it open about 6 inches in the cold.

Ah right, yeah I have the estate

16 X 44 ? What do these numbers relate too?