Did you buy used or new tyres?
I just got 4 new tyres the other day too, I fitted 165/75 bridgestone tyres. Top of the line. Was going to go for 175/75 but thought it would be too heavy
Got it balanced, and a wheel alignment too, all up it was nearly 300$.
My rear seats are a mess too. But i dont have passengers so it's ok for now =]