a/c pressure switch and plug

[immajackuup]

do i have to buy these two parts for the new dryer im going to buy???

http://www.pelicanparts.com/cgi-bin/...2%29%2C%20Each
http://www.pelicanparts.com/cgi-bin/...ryer%2C%20Each

my car is a 1991 318is,should I already have it???
This is the dryer i'm buying
http://www.pelicanparts.com/cgi-bin/...%20terminal%29
http://www.realoem.com/bmw/showparts...42&hg=64&fg=60

[immajackuup]

nvm