91crx93civic

need injector seals for my turbo z6 w/ dsm 450s. stock z6 intake. have searched and found everyone saying get new stock seals for the civic. ok i looked and found that some sets have only 3 seals fron napa but also found sets that have 4 seals from beck arnley. the difference is the extra seal in the arnley kit looks taller than the one in the napa kit. how do i know which hieght to use and will i be ok with the napa kit. thanks in advance.