It would depend on how much you want a 20 year old airbag or not.
If you are open to removing the oem airbag, I'd suggest going with something like a momo montecarlo for your car. I'd also repalce the seatbelt reels with those from an NA8 and i'd remove the safety loop stitching.
If you want to keep the oem airbag by all means necessary, then go with that spacer.
When I finished, there were three unused wires. On the Metra adapter, the Blue wire for the powered antenna was left out because it's not on the Pioneer harness. On the Pioneer harness, the Mute and Reverse Gear (for backup camera) wires were left off because of course the Mazda harness doesn't have those. I taped them off.
This morning, I started on the install. My son was going to help me by holding the light and screwing things in. His sister got word that we were working outside and wanted in. Since I had nothing for her to do at the moment, she read quietly.
I didn't take a picture, but my daughter helped me by running the wire for the microphone through the dash to the back of the radio cavity. With that done, here are the four inputs: Mic, Antenna, Main Harness, and USB.
Thanks to the long USB cable, my phone got relocated to the console out of sight. I ran the cable the length of the console and popped it in under the switches for the trunk and gas lid. Now I have nothing in front of my hands or the radio (which means that fancy ProClip mount I paid like $80 for is now useless, lol)!