doubtful you will find any packages for your 89. You'll probably have to build your own set-up. Do some searching on the B12 forum, and you can see what some people there are using.Depends what you are trying to achieve. Here is some quick help, struts are availible through KYB, Tokico, and KONI , you can get some springs through Ebay and Sprint performance, B13 Sentra front and rear strut tower braces will fit, and you can get yourself sway bars from a twin cam KN13 pulsar of the same years.
