You should put the bushings in the new rack...not the old one (they won't do you any good on your trail spare). In fact, I would recommend running a used rack with a bushing kit, before I would run a brand new rack with stock bushings. In short, the bushings are the problem...not the rack itself. Unless your rack is broken or not working properly, I would spend the money on the bushings and install them on your existing rack. Likewise...if you must replace your rack, install a bushing kit with it. One of the best bangs-for-the-buck you can do to an H3.
There are several places making them but, I installed the kit from Outfitter Design on a customer's Alpha about two months ago, and it works like a champ. Installation was fairly straight forward, and the results were immediately noticeable. IMO...worth every penny.