Where shall I stick the Hertz crossover on a t6.1?

[Kingsimon2000]

It's new speaker day today and I've managed to get the door card off ( new door card clips coming via Amazon ! ) . I've got the original speaker out ( OMG how sh*t are they? ) and I'm trying to get my head round where to stick the crossover box... any thoughts as the layout of the t6.1 is not the same as the t6... really plasticky..

Here are some pics...