Rick,
this is quite involved,and you could get lost! But here goes---
Assume you're running Windows XP.
Go to
http://fly.to/AirNet/ Scroll down to 'Production Lists',and click 'A to M'
Scroll down to Cessna,and 750,and click
Click on the 750 picture(after disposing of pop-up!)
Click icons as displayed, 'Windows',then 'Desktop',then 'c750'
At top of list,click 'Edit' ,from drop down menu select 'Find'
Type in N45ST,then click 'Find next'
N45ST is highlighted at bottom,with msn details.
From there,I did a search for Citation 750-0054 on Google,and came up with a pic of N450T on !!!!!!!!!!!!!! (which was the next identity for this aircraft).
I went back to the FAA site,and discovered N450T was not current,so then searched the FAA site for Citation 750-0054,and found N610HC! Phew!
Are you following this?!?!
Make a note of that Airnet site,EXTREMELY usefull!