I think the best joint around for 4 links is the super pivot that avs sells:
http://www.avsontheweb.com/product.php?productid=766&cat=233&page=1
They have a 1" grade 8 stud tig welded to it but are also available with 3/4" stud or no stud but since you might be wanting to buy alot from somewhere you may have to purchase them blank. The joint is fully rebuildable, just unscrew the end peice with the spanner wrench. I like then because they use the same mounting tab dimensions as a bushing