i always get the densos, my parts stores dont carry the ngks.
i love them.
tell them a 94 delsol vtec. in 94 there was an s, si, and vtec. this is true all the way until 97.
if theyre retarded and cant find that, i dont see why the 99 civic si wouldnt essentially be the same thing. or even a 94+ acura integra gsr should work.
like everyone else said, bosch is bad, theyll burn up in a matter of weeks, theyre made for domestic cars.