I'm not sure an original rolls exists. You might contact someone on the research staff at the ADAH in Montgomery AL, or its equivalent in Nashville, since Forrest's command was considered a Tennessee unit.

Here's a link or two for Rev. Kelley and the early history of Forrest's Regiment:

http://www.terrystexasrangers.org/library/confederate_veteran/cv_v3n2.html
http://www.tngenweb.org/civilwar/csacav/csa3forrest.html
http://www.angelfire.com/al/gurley/gurley.html

Kelley's men were also reputed to be the original Alabama "Yellowhammers":

http://www.srnews.com/SRNmontgomery/section5link1.html

Here's a Kelley quote on Forrest after their first action at Sacremento KY:

His Major, a celebrated preacher and subsequently an equally celebrated Confederate Colonel, D.C. Kelly, saw him then for the first time under fire, and thus vividly describes the wonderful change that always took place in his appearance in a fight: "His face flushed till it bore a striking resemblance to a painted Indian warrior's, and his eyes, usually so mild in their expression, blazed with the intense glare of a panther's about to spring on his prey. In fact, he looks as little like the Forrest of our mess table as the storm of December resembles the quiet of June."

Here's some information on the Sacremento KY battlefield:

http://campus.murraystate.edu/academic/faculty/Bill.Mulligan/sacbatour.htm

Kelley's company was called the "Kelley Troopers":

http://www.rootsweb.com/~almadiso/confunit.htm

Good luck in your search!