How do I tighten mounting plate to front driver's side strut assembly?

the strut was changed approx 1 year ago. I ONLY need mounting plate to be replaced. Is there specific tooling I will need? I have sockets, open ends, and floor jack. Should I leave it to a mechanic instead? Can I buy mounting plate from an auto store (Kragen, Autozone,etc.)?

you need a spring compressor. we offer a service for take in for a charge of 25 if you remove the strut and bring it in. any pepboys offers this service. Roy

Did the original shop tell you that the plates were bad but you declined the work and just replaced the struts? I would chalk this up to a learning moment and take it back and have the rest of the job completed. Do both sides though and be done with it.

They replace the struts and did not recommend changing the mounting plates initially. A week afterwards, rattling sound was coming from both back assemblies. They kept on tightening down bolts, but rattle remained. Finally Manager got involved and recommended mounting plate replacement to rear. It worked.