Before you go and purchase replacements. If the only symptom you have is the clicking, unless the boots are torn, they may only need to be re-packed with CV joint grease. It is a fairly easy (but messy) job and will only cost a few dollars.
Here is a tech article from rennlist that describes 85.5 &up 944 CV joint maintence, but it applies to early ones as well.
http://www.rennlist.org/techarticles/944Constant%20VelocityJoint.htm