Orion Motor Tech SET OF 4 Ignition Coil for Mazda RX-8 1.3L R2 UF501 N3H1-18-100B-9U N3H1181009U N3H118100A N3H118100 N3H118100B N3H118100B9U 5C1450 50231 N3H118100A9U Each coil is design for low-emissions and high energy output. Manufacturer Part Number: UF501 N3H1-18-100B-9U Interchange Part Number: UF501 N3H1181009U N3H118100A N3H118100 Other Part Number: N3H118100B N3H118100B9U 5C1450 50231 N3H118100A9U Placement on vehicle: Front