VW Caddy door speakes replacement

[psyone]

Hey guys, got myself some new audio gear to put into a caddy, got Pioneer F930BT head unit. 2x JL amps (2 chan and mono), 2x 10" JL subs to go under the seats and JL C2600 splits to go into the doors.
I've ran supply to the amps without much trouble, but when i got to the door speakers thats where i got stuck. I took the door trim off (not completely, there was a door look cable still stuck on the door trim). The speaker is in the bracket but theres no screws that attach the speaker to the bracket from the front and the bracket is pop riveted to another panel on the door (which i couldnt remove for some reason even after undoing all the bots that hold it and and also the power window motor). Heres the pic


If anyone changed their speakers, how did you solve the problem ?

Cheers,
Eugene.

[psyone]

problem solved. made new space rings out of mdf, drilled the pop rivets out and mounted new ones