Fitting coils this weekend. Advice please!

Hey everyone, I've just read the thread on fitting coils and i know it said it's not necessary
To get rear bolts but the cars 28 urs old and I'm
Thinking maybe just maybe some new ones are in order? I've got new top mounts and bump stops ect, but where can I get these bolts and how quick?and how necessary? I really need to do this this weekend really!!!! Thankyou all.
Da

i done loads and never changed the bolts mate