Dude, you can get the seats from Cha Sultan, If you want I can recommend you a guy who I deal with, but if you are looking for grey color its rare man, if anyone in the market has it, he'll be asking 20K at least for that.
Maroon is available in the market at the cost of around 8 to 12K depending upon the condition. I changed mine from Shoba bazar Peshawar for 9K 2 years back.