These bulbs have 2 functions: 1) a steady taillight (constant light) or 2) a strobe light (they flash like an emergency beacon). To get your lights to strobe turn your light switch on; to change to constant light, turn your lights off and then back on again.
The last picture is the JD standard miniature light bulb these LEDs replace.
There is a picture of my Kubota, however, the wiring harness for the listed below models have the same sockets.
If your tractor uses a different style bulb, please send me a picture we can match it.
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* Note: First Class shipping is the most cost-effective delivery, however, it is not insured. If you would like your item insured for loss or damage, please select Priority shipping.