What size are the speakers in a 1995 GMC Sierra front and back?

front= 6.5" need a custom speaker bracket or will have to screw speakers directly into metal door paneling around the speaker hole. Rear= 4X6 paneling comes off by removing any screws first, then popping the panelling off with a screwdriver around the fastners; same for front also. Door window crank handle comes off by pushing off a horseshoe clip that fits around the shaft of the crank. A special tool that is very thin fits directly behind handle and a very thin plastic backing immediately behind handle.