The trouble with split rims is that if you ever need them serviced, there aren't many shops that'll touch 'em. If you have someone willing to swap the tires on the rims, you should be fine. The only other concern, is that some state's safety inspections won't permit split rims for safety reasons. That's why you won't find new ones.
I just bought new rims (single piece) and tires ($$$). Depending on the style of the rims, you may be able to have the clips attached and still maintain some of that original look.
