Test the speakers first. Pull one from the roll bar pod and connect the dash speaker to the pod wires to see if they work and or check the dash with a pod speaker.
If you need to replace, get a set of 5 1/4 adaptors. They are around on the web and ebay (or you can make some yourself) The adaptors will let you use a more common 5 1/4 which will sound better and have more choices.
If you have to buy new ones, Crutchfield is way over priced.