91crx93civic

need seals for my boosted z6 w/ dsm 450s stock IM. searched and come up with every one saying get seals for the civic and dsm will work. great. now i called napa and the have a kit for my 93 civic ex it has 3 seals in it then i found a beck arnley kit that has 4 seals in it. 3 look the same as kit from napa but has another that is green and appears to be quite taller than the other black one in the kit. which height do i need the napa guy said the kit they have is what i need and doesnt know why there is an extra seal in the arnely kit. any info would be help ful. thanks H-T.