Please get rid of these sidemirrors and rims, find the original rims, lug bolts and chrome accents and centre caps. The original wheels are supposed to be ET35 hubcentric wheels made by FHI. The original side view mirrors can also be found.
To ensure that your car does not rust from the front wheel wells, remove the front fenders, and clean out the entire area and the fender, then coat it with butyl based undercoat. When putting the fender back on make sure that you use autobody silicon on the top length of the fender - Mazda also used it - its to prevent mud and water getting trapped and rusting the body where you cannot see it. There are supposed to be 2 shields on the inside of the fender which I can see are missing, one is to stop dirt/water to splash onto the front door cavity, damaging the hinges and door holder and the other is to protect the front of the fender and the wiring to the indicator
Also if you are facing water leakage or dampness inside the car - then your door cards do not have any plastic lining behind them. Mazda used very thick plastic for it. The shape of the doors and angle of the windows are such that water trickles on the inside and ends up inside the car. The plastic sheets are to make sure water stays inside the door cavity and get drained from the holes on its lower side. To stick the sheets do not use Samad Bond - you need to get a roll of Butyl tape (some A/C shops will have it and most windshield replacement shops will have it too - its a black tape that is very sticky and soft). The door has grooves for it already.
My father bought a fully equipped '75 929 (auto, power windows, central locks, power steering, courtesy lights etc) when I was very young - and had the doors fixed like that. He also asked his favorite denter to remove the fenders as they were lacking the sealing silicon and the inner shields. I remember that car to be very quiet on the highway even at speeds of 120 km/h and it had a very cold A/C