I have not long bought an E36 BMW. Since driving the car my lower back hurts. I thought it could be the seat so bought another seat from a scrappy and my lower back still hurts? It has only started hurting since I bought the car. Are BMW E36 seats prone to having a weak spot/breaking as in causing some kind of back pain?

Any advice would be great as in a bit of pain here and dont really want to use the wifes 1.0 Polo!!