You're gonna need to do some cutting to make the magnet fit...

If I remember correctly, the g3 tegs have a plastic baffle that the stock speaker kinda sits in. try hacking that up to see if the kappa will fit. If not, the you'll have to take out the plastic baffle and get a foam one (i.e. from crutchfield) to keep the speaker protected from rain seeping in. That's what I did in my old 94 LS when I installed my 6.5" MB Quart mids.