OK, here's a shuttle drawing I made, that is reduced in size. To see a bigger version where the STA numbers are readabler, click this link:
http://georgesrockets.com/GRP/Scale...tlesideview.GIF
And then there is a webpage I have, with a lot of scans of ICD's, mostly of the ET and some SRB.
http://georgesrockets.com/GRP/Scale...a/ICD_data.html
The drawing below shows ET attachment struts for the orbiter.
Detail "D" is the bipod that attached the ET to the obtier nose. Note that at the top of the bipod, defines STA#'s for both the ET and the Orbiter in the "X" axis. The XT is the Tank's X cordinate, and XO is the Orbiter's X coordinate, a common reference of the same exact place. A bit down from that, you see a ZO 283.841, for the Orbiter's interface plane in the Z axis.
Use this link to see a larger readable version.
http://georgesrockets.com/GRP/Scale...Orb_struts2.GIF
BTW - that particular Detail D shows that the shuttle orbiter moved upwards 5.5 inches from before fueling, to launch. Because of the ET tank shrinkage when loaded with liquid hydrogen (The SRB aft struts also pivoted to account for the shrinkage).