If the front end is sagging, your springs are letting you down (or broken!).
I would surmise the car was driven hard or on rough roads a lot (or both); the front end probably needs a reconditioning and definitely check the springs.

If someone did the rears and didn't notice what I suspect might be a broken spring up front, shame on them...it could be a dangerously damaged front suspension.

I would get front mounts, struts, springs, bump stop/boots, and set them all up so you don't even have to worry about a spring compressor to disassemble the old units (you'll need one to put the new stuff together); it sounds like there is nothing worth saving there if it's as badly worn as I suspect.

I'd also strongly suggest new front end bushings, an alignment (as part of the strut replacement), and having the alignment shop confirm that all your work has completely fixed the front end's problems.

Honestly, if the wheels are rubbing the fenders often in regular driving, the suspension is dangerous.

Ben