I recently purchased the Past to Future Martin D-18 impulse response files from here.  These IR's were recorded in Mono, Stereo, with 3 Mics and all with different mic positions. (All Vintage Neumann mics with Telefunken mic pres). Digital and audio tape versions are included. Here're clips of the acoustic guitar bridge pickup DI from a song I'm mixing with and without the digital stereo 3 IR effect in the MConvolutionEZ.