It depends what has been fitted and how they have been fitted.... Nsxprime have various examples of mounting boards that bolt up to the original Bose mounts... Basically a bit of ply cut to shape.....
Also is the headunit original, in which case there will have to be an amp somewhere for aftermarket speakers....
aka Jonathan!!
'92 charlotte green auto.... as a daily
'37 Ford Y street rod......... something for the weekend!
...... if a photobucket pic is foggy, click it, and it'll take you to the clear version, yes, it's a clicking faff....