Re: Sgt. Spencer Wright, 37th Inf. Al.
No, as I previously noted, there are no post Vicksburg, July, 1863, muster rolls. We do know he served post Vicksburg by a pay receipt and an issue of clothing April, 1864. No more via the Compiled Service Record sources.
Unfortunately for most Confederate organizations, muster rolls for the last year of the war were lost, most likely in the sacking of Richmond, April, 1865.