Hy guy!
If you want to change your rear speakers, it's really easy.
Follow this :
viewtopic.php?f=6&t=6552If you wanna run with a single speaker, don't put the tweeter
For the head unit, toyota sells an adaptator for ISO plug.
If you don't want to do it, I give you some names but I don't know if they work well :
Gibrat Elec Auto
zone artisanale Aiguille 46100 FIGEAC
Tel : 05 65 34 59 24
Osée André (SARL)
route St Céré 46130 BRETENOUX
Tel : 05 65 38 44 60
See ya!