These bulbs do work with later positive ground tractors.
They do not work with 6 volt tractors.

Feature:
Good light type, Low power consumption and super bright lighting,the position of the light-emitting point is close to the original car halogen lamp
No delay to light up, Faster on/off response time, low power consumption and high lighting,Good Quality And Durable,Easy to Install,Good Feel
Lifespan: Up to 30,000 hours working hours ,Adopt imported chips emit 360 degree light can light up every corner, stable quality, long service life
The model is as the same as factory light, no need to change car wire rute,just Plug and Play, NO modification required A direct replacement part that easy to install
With High-purity brightness, strong penetrability and superior stability,Energy saving, environmental protection, through strict test, Use safer driving in the car,highly recommended.

Specification:
Color Temperature：6000K Xenon White
LED Chip：78PCS 3014-SMD LED CHIPS
Waterproof Level：IP65 Waterproof & Shockproof
Power：4W/per bulb, 8W/per Set
Beam Type：360°Beam Angle
Certified by：CE & ROHs
Work Voltage: DC 12V
Lifetime:More than 60000 hours

Package Include：
2x LED Bulbs

Fit:
Fits Allis Chalmers Tractor(s) B, C, CA, D10, D12, D14, D15 (s/n 9001-eailer), IB, RC, WC, WD, WD45, WF
Fits Case Tractor(s) DC, LA, SC, VA (s/n 5400000-earlier), VAC (s/n 5400000-earlier), VAH (s/n 5400000-earlier), 900
Fits Case Construction & Industrial(s) 600
Fits CockShutt / CO OP Tractor(s) 20, 30, 40, 50, 540, 550, 560, 570
Fits International Tractor(s) A, B, C, Cub, H, HV, I4, I6, I9, M, O4, O6, W4, W6, W9
Fits John Deere Tractor(s) A (Styled with sheet metal dash), AO, AR, B (Styled with sheet metal dash), BN, BNH, D (s/n 143800-later), H, R, 50, 70 (diesel), 70, 80, 520, 530, 620, 630, 720 (diesel), 720, 730 (diesel), 730, 820 (2 Cylinder), 830 (2 Cylinder)
Fits Minneapolis Moline Tractor(s) BF, Big Mo (400 & 600), Big Mo 500, GTA, GTB, GTC, Jet Star, Jet Star 2, Jet Star 3, M5, M504, M602, M604, M670, M670 Super, R, RT, U, UB, UT, V, ZA, ZAE, ZAN, ZAS, ZAU, ZB, ZBE, ZBN, ZBU, ZTN, ZTS, ZTU, 4 Star, 5 Star, 335, 445
Fits Oliver Tractor(s) Super 44, Super 55, Super 66, Super 77, Super 88, 60, 66, 77, 80
Replaces bulb numbers: 93, 97, 97A, 97NA, 199, 631, 1073, 1095, 1129, 1133, 1141, 1156, 1156A, 1195, 1295, 1295NA, 2396, 3497, 7506, 12088