Spark Plug B5ES / N21 / AG5

Allis Chalmers 170, 175, 180, 185, 190, 190XT, D19
Ford / New Holland 2000, 2000 US Built, 2110LCG, 230A, 230A US Built, 231, 231 US Built, 234, 2600, 2600 US Built, 2610, 2610 US Built, 3000, 3000 US Built, 334, 335, 335 US Built, 340, 3400, 3400 US Built, 340A, 3500, 3500 US Built, 3550, 3550 US Built, 3600, 3600 US Built, 3610, 3610 US Built, 4000, 4000 US Built, 4110LCG, 420, 420 US Built, 4400, 4400 US Built, 445, 445 US Built, 4500, 4500 US Built, 4600, 4600 US Built, 4610, 4610 US Built, 5000, 5000 US Built, 515, 515 US Built, 530A, 531, 531 US Built, 535, 535 US Built, 540, 540A, 545, 545 US Built, 550, 555, 6600
Massey Ferguson 135, 135 Gas / 135 Petrol, 35, 35 Gas / 35 Petrol, TE20, TED20
Mitsubishi S550/Elk, S650 Bison
Satoh S550/Elk, S650/Bison