High quality JDM speaker adaptors for Toyota (Innova, Fortuner, Hycross, Corolla, etc.. may not fit Maruti Toyotas) and usually not found out of Japan. Made out of die-cast aluminium and nitrile rubber for long life.

Drill out the rivets holding the OEM toyota speaker and install this adapter with M4 bolts into existing three holes vacated by the rivets. The M4 bolts ensure that rivet need not be enlarged either. Then mount the speaker onto the diecast aluminium bracket using M4 screws. If you are thinking of MDF spacers or plastic spacers to mount the speaker on your new Toyota this will be a better option and will last the lifetime of vehicle and does not need replacing when upgrading speakers again.

I have 2 pairs of these with me for front and rear doors, its used but as good as new. Expected price for 2 pairs (or 4 adaptors) is Rs.6000/- Slightly negotiable.

"High-quality aluminum die-cast bracket is used to achieve high rigidity around the mounting part. Combined with damping NBR rubber, the speaker is firmly fixed to the vehicle, further improving the sound quality. In addition, it has high versatility such as being compatible with 180 car models."

Product page: https://www.kenwood.com/jp/car/speakers_amplifiers/brackets/products/skx-102s/