Will suggest u to get the poshish stitched to ur seats instead of ready-made poshish, which they fit with rope ties.
Stitched poshish is quite durable than useless ready made one.
Ready made one is between 1000 to 1800 depending upon so called quality of material.
Stitched one will cost u between 3000 to 5000, it will also take 4-5 hours for fittings.