FYI, make sure you don't get the monroe "econo" or "monroe-matic" struts. They're complete garbage. Get the "quickstrut" brand (which is the "sensa-trac" already assembled).
If all the parts are old, I don't see any use in only replacing the strut. The quickstrut saves literally 75% of the total amount of labor, is a lot safer (not having to compress the springs), and gives you all new parts for a fraction of the cost. After 10 years, I figured the bearing plates had to be old too, the springs couldn't possibly be as strong as new,... even the rubber boot can wear out. An extra $50 for all that PLUS assembly? I'm surprised anyone buys the parts individually anymore (other than if one specific part is defective or something).
The difference the new struts make is incredible!