EMPI's super strong double walled polyethylene High and Low Back Seats just got better. The seat and back areas have been recontoured for added comfort and lumbar support. The finish has been upgraded for a great show car look. EMPI seats feature a strong double wall shell, contemporary design, permanent-mounting inserts molded into the base, slots for seat belts and shoulder straps. Use without seat covers for low maintenance or add our thickly padded high grade vinyl covers in black or assorted colors with (2) snap fasteners for that one-off custom look and added comfort. Seat covers now come with two harness slots making them usable on many manufacturers' poly seats. EMPI molded into the plastic. Now uses 6 - 10mm x 1.5 threaded inserts.