they will probably blind oncoming traffic. I cannot say for sure though, the light housings are set up to reflect a set brightness of bulb with the filament in a particular location, brighter bulbs and movement of the filament will result in aim changes.
LED is like 4-5X life expectancy if it is like all the other led bulbs. it you go by hours, do a search. Those silverstars are junk, i got a notice in the mail of a money back class action lawsuit about them burning put too often.
everything else is dependent of what you buy and what comes in the kit, just because it is a build replacement does not mean it is 100% match to the original bulb design.
I would thin any led bulb would work if you replace them in pairs and match specs to the ballast.