"how old are the springs ?"

Are you serious? They're at the age where they no longer at the seat pressure that I need. So they are 90lb seat pressure old.

I wouldn't have the faintest idea mate.

Datoboy the replacements were bought a while ago, not sure where from I'll have to have a think. Coupled with the inner spring they pressed 150lb shut so that was a little too much for a street engine.