Dear Melanie,
Go to this site:
http://www.itd.nps.gov/cwss/regiments.htm
in the boxes provided enter the following:
Union or Confederate - Confederate
State or Origin - Texas
Unit No. (or Ordinal)- 17
Function - Cavalry
then click on "Submit Query"
You can then choose the unit, in which, you're interested and look at the roster online or download a spreadsheet file to your computer.
Hope this helps,
Jim Martin