Looking for 1 7/8 wide neck  6 string
prefer spruce with rosewood but would consider other woods

The Larrivee L- 03 series 12 string has a 1 & 7/8" neck. I'll bet if you contacted the company, they could easily make you a 6 string version model with the same neck and give you the string spacing at the bridge you want. FWIW, I have a 2005 LV-03 12 string and I absolutely love the neck on that guitar while the rest of my Larrivee 6 strings have a 1 & 3/4" neck.