hillerup
There are basses, and there are Thunderbirds!
How do I know which one I have?
I lost track here about what you're asking about... Are we talking about which bass you have or do you have a set of pickups, you don't know which model are?
Post a couple of pix - And maybe I can answer your question as I have both regular Epi's, Pro's, Classic Pro's and Gibsons...