Rockauto.com has the best on line reference for the VX and aftermarket/OEM parts I have found:
http://www.rockauto.com/catalog/raframecatalog.php
Here is the link for if you wanted to compare 2001 Isuzu Vehicross ball joint options, note that if it was the OEM it will list it as such and if it is heavy duty it will be listed that way as well:
http://www.rockauto.com/catalog/rafr...363283k1034827
Or right now I need a new center link and from Isuzu it will be $202 shipped to my door but on rockauto.com I found 3 different options for our center link and the Beck/Arnley part for $120 seems to be the best bet for me right now:
2001 ISUZU VEHICROSS 3.5L 3475cc V6 FI (X) [6VE1] : Steering : Center Link Price Core Total
BECK/ARNLEY Part # 1014722
Front $119.89
SPICER/RAYBESTOS Part # 4401143 {Professional Grade} (Only 5 Remaining) $124.79
MOOG Part # DS1432
Frt Strg $191.79
Also on rockauto.com if you click on the part number it will bring up a list of the other cars that share this part with the Vehicross for easy cross referencing. It really is the best online parts system I have ever seen, and by far the most comprehensive Vehicross parts list I have seen, even beyond the Isuzu provided stuff because this incorporates all the non-OEM stuff into one place.