front AND rear shocks?

[Festively Jolly]

well i ordered some bilstein shocks and on accident, ordered 2 instead
of 4 (i was planning on replacing them all).  well the front are shot...
NEED replacement.  but the rear are just in fair condition.  would
replacing just the fronts be an ideal idea?  or would that mess up the
ride alot?  i know the bilsteins are rather stiff (good)  and the oem
are kinda mushy.  well some help is DEEPLY appreciated!  

thank you all very much! later