How important is it to replace the strut mount when you replace your struts

Very! ... Best to buy the strut *assemblies* .. Then you've got new coil springs and ALL hardware .. Only a few more bucks, in fact less that buying all of the components! .. Plus less labor to install... It's a win win .. ONLY way to go!

if you don't and the bearings go bad in em/and start rattling,you will wish you had put new ones on.it will drive you crazy,and lots of folks will be staring at you! it'll be loud,if they go bad.