Hyundai Repair: Tiburon clunky noice after strut replacement, rear strut, noice

Question
I recently have had struts/shocks (all four) replaced (by a good local repair shop) on my 2003 Tiburon...

When hitting small bumps, have an annoying 'thunk'/'clunk' sound on JUST THE REAR PASSENGER SIDE...
Repair guys have looked at this twice post replacement, assure me that all bolts tight and mothing mechanical wrong... but this noise is still there!!!

Any suggestions???
Causes?
Previous experiences with similar problem?  

Answer
Presuming this noise wasn't present prior to the strut replacement, you should be looking at the right rear strut and its related components.  It's possible the upper bushing or mount is worn or installed improperly.  It's also possible (although unlikely) that the installed strut was defective.  I cannot say I've heard of this problem previously where the noise occurred only after strut replacement.