I would replace, always gives you the chance to upgrade also. Idk your budget but if you want really nice I would go with Corbeau LG1 or CR1. Im getting the LG1. Or you can get a good cheaper set from AM. I just dont like the cheaper seats anymore because I had an eBay pair and I was rear ended one day and not even hard and the seat bent all the way backwards. So next time I'll buy a good quality set.
You can't lose if you put God first!
1989 LX, 306 with TF top end kit, Anderson N-21 cam, TKO 600 trans with steel splatter shield,full Maximum Motorsports Mustang maximum Grip box, Detroit locker rear end with 31 spline Moser axles. Staggered wheels with Nitto 555 315/35/17 out back.