Is the same dash speaker used for a ac and non ac cars? I know aftermarket specifies for ac or non ac because I guess they can put a bigger speaker in non ac cars. Im just not sure about the original. I have ac and am looking for one to throw in there. I stupidly threw it out back in the 80,s. I want to put my original am/fm back in and have it working. Im planning on hiding a modern unit somewhere.