Just bought a COLT Attivo 2002, and started to do it up. Got a new headset and been offered some brand new speakers at a good price, 2 sets of Infinity 6520 SCS (Reference Series/Shallow) with an Alpine PDX-4.100 Amp. Before I buy them, wanted to know whether they will fit, which would be brilliant,or how I would find that out? Never done speakers before,so any help would be appreciated

 

Im pretty sure youve got 5.25 in the fronts and 6.5s in the back... in inches.