First post, huh?
Welcome to the Forum from NH.
Lots of knowledgeable folks here who freely share their knowledge, experiences, and perspectives. Knowledge is power.
I hope that you will become a participating member in the Forum's discussions.
Pics of the truck, please.
I believe that your truck's headlights use a very common incandescent bulb, so finding a cross reference LED light should be easy. Most sites that sell LEDs have cross reference charts available, or a plug in your truck make/year/model or a bulb number, and the site will tell you what products are compatible with your bulb number.. If they don't, its probably not the best site to purchase LEDs.
Most LED conversion kits will come with the LED lights and an plug in transformer, just like the one in your referenced link. Good LED lights are not cheap, and the price on your referenced link would be a mid-to-high range. You get what you pay for, at best.
Make sure that the LED headlights that you purchase are adjustable, meaning that the LED assembly can rotate within its outer shell, so that you can properly position the LEDs during installation. The actual LED beam adjustment mechanism is different for different brands/models, but the instructions supplied with the LEDs (or an installation guide on their product web site) should guide you through the process.
Bottom line, the popsicle stick in the LED headlight holding the LED chips needs to be as close to vertical as possible, after installed and locked into place in the headlight housing, with the LED chips pointing to the 3 o'clock and 9 o'clock positions. The photo of the guide below, while not for your specific brand/model, will give you a visual sense of how these LED headlights need to be positioned in a correct alignment within the headlight housing.
View attachment 390920
Let us know if you have any additional questions.