MSD Cross Reference with NGK® Plug Type to Stock Number For reference use only Plug Type Stock No. 4-Pack PN Plug Style B-4 3210 37384 15IR4Y B4-LM 3410 37374 15IR4 B5ES 6410 37324 11IR5 B6ES 7432 37344 11IR6 B6S 3510 37404 15IR6 BCP4ES-11 1086 37244 7IR4Y BCP6ES-11 ...