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Retrofitting the factory headlight assembly to HID is illegal and produces excessive glare to oncomming drivers. The optics of the assembly are designed for the halogen bulb not the HID bulb. Also with most kits you won't have high beams. Please don't do it. If you want brighter headlights then get a pair of relays from LMC and some good bulbs.
The DDM kit comes in a low/high beam model. Texasguy has a good point but my opinion is if you pick too "blue" of a light it is darned annoying. Someone correct me if I am wrong.
the ones i bought were off ebay and i am very satisified. They plugged right into my harness and the box mounts right to your radiator core support. Nice and easy and you can see anything you need to
The relay harness connects directly to one of the factory headlight connectors and then goes to each of the headlights. The kit is heavier gauge wiring. You don't have to buy anything else, except for maybe add a heavy duty 30 amp fuse to the hot wires.
Your truck probably has 9004 bulbs. I think that 9007 is for 92 up.
These kits are not 9004, you may have to ask the seller if they have one for your application. If you look in LMC Truck catalog it has the different years listed.
I have used this one and its a good kit. Its the same as the LMC kit.
do they connect right to the factory harness? also wuld i need to get bigger wiring or not?
Its simple you dont have to do any wiring. only connection is battery neg and pos and connecting one headlight connector. Real simple. And i agree with everyone as the k of the lights goes up the more anoying it looks 6000k is best imo