Here is the link to the injector cups I have these or part number is there for you.
http://creaturesofthenightperformance.com/LB7-Injector-Cups-P315482.aspx
Also all the Gm spec's are already posted on this site tq or repair.
http://www.duramaxdiesels.com/forum/forumdisplay.php?f=97