How do I replace spring seat (front of FWD car)?

The spring seat of a 90 olds cutlass supreme rusted through and needs a new one, Do I need a spring compressor to change it, if so will this work

http://www.harborfreight.com/automotive-motorcycle/suspension/macpherson-strut-spring-compressor-set-3980.html



here is a picture of the spring seat

http://www.flickr.com/photos/23877967@N04/4583049324/in/photostream/



what would a shop charge to fix this?



Thanks!How do I replace spring seat (front of FWD car)?
best and cheapest in the long run is to replace both complete strut assemblies as the springs are worn out too , plus the upper bearing plate is most likely shot .

then an alignment



Replaceing one side the car will most likely want to go in circles

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