99 V70XC Really horrible sound in R. front going over bumps

[larryh]

The spring seat (the rubber bit) is often the cause of noise.
Aftermarket seats are really bad. Mine went bad in 30K miles. I think the genuine volvo seats are the best but even those are under built and don't last very long.., so someone figured out that the xc90 seats fit perfectly in a v70 and are a little more beefy, so that's what I use. I have no experience with the ipd parts. They offer three seats
http://www.ipdusa.com/Volvo-S70V70-1998 ... 3-492-785/
the heavy duty seats are the ones recommended by jrl above.

[carlsun]

Ok, so the XC90 spring seat should fit. What about the XC 90 strut mount? Can I do just one side or do I need to do both to maintain symmetry?

The sound I'm hearing is like someone hitting the frame with a mallet. I replaced both the spring seat and strut 1.5 years about because the spring seat was broken. That sound was distinctly different; it was like metal hitting metal.

Thanks for all the help!