MSD Cross Reference with NGK® Stock Number to Plug Type For reference use only Stock No. Plug Type 4-Pack PN Plug Style 1084 PFR6A-11A 37274 7IR6Y 1084 PFR6A-11A 37424 7IR6YS 1086 BCP4ES-11 37244 7IR4Y 1127 BPR4FS 37204 6IR4Y 1233 BPR5EY 37334 11IR5Y 1465 IZTR5B11 37124 ...