offset upper control arm bushing placement

KosmicKuda, thanks for the explanation, that makes perfect sense, Trailbeast, you are right, the originals did have a insert/washer that can not be transferred, however the one I was referring to was the one on the end of the bushing that has a slight collar on it but I guess like AJ/formS says I need to re-install these probably for were and tear reasons? however my Napa ones didn't come with new washers and I think some of the old ones got thrown out with the old bushings we removed but seeing as these are new/used donor upper "A" arms and the originals are still on the car we will just use those when we do the job, thanks for all the help and explanations, only want to do this job once and correctly!