For a lot less money you might want to try some door latch springs? My doors always required a little extra to get them to close, but I found an old spring and tried it out, and my doors close like butter. Thier real easy to install, they just slip on over the old latch flapper. I couldn't beleive the difference it made.
http--www.chevsofthe40s.com-detail-21101-Chevrolet_DOOR_LATCH_REPAIR_SPRING.html
