If your 1200 came with a factory radio, the factory speaker and grille mounted on the kick panel under the dash. The stereo option came with two of these, one for each side.
Overview
Stock factory speaker
? 27932-B5000 UNIT-SPEAKER (AM) 620
? 27932-B5010 UNIT-SPEAKER 620 0778- < 99993-A0121 $23 USD
You can fit high-quality speakers in the original location:
When the speakers are real big