dust caps

Ok so I have a JL w0v2-12 that I am using as a home audio sub and it got a puncture in the cone and it has slowly grown over the years and now it is making quite an annoying noise on low notes. This is an older model and I don’t have original purchase receipt so JL warranty is completely out of...

I just got a used Audioque hdc3 18, dual 1 copper coil... But that has nothing to do with what I'm about to ask, I'm wondering what size dust cap these really have, I measured from the each end from where the glue flange is, not sure if thats correct but it's 7", but if I measure just the capo...

Just as the title says!!