I understand that Fender makes a "D Neck" that is 1 7/8 inch at the nut. Was/Is this neck standard on any Fender six string electric guitars? I need lots of finger room at the nut and would like to find a vintage neck if possible, rather than a new custom shop order or licensed manufacturer such as Warmoth.
Thank You, Mike

Yeah vintage is the only way to go if you don't want something from the Custom Shop or the likes of Warmoth. You are not going to find any production line Strats with a wide neck width these days that I'm aware of. You are describing the coding system Fender used for custom neck widths from '62-'69. Even then, they were special order only.

"Neck Width.
From March 1962 to 1969, Fender marked their necks with an "official" neck width letter at the butt of the neck (in front of the date code). The "B" neck width is the normal width, as used on about 99% of all Fenders from this period. All other sizes were available by special order only. Also all pre-1962 Fender necks have a 1 5/8" nut width (though I'm sure there are some exceptions, but none I have seen).

A = 1 1/2" wide at the nut.
B = 1 5/8" wide at the nut (normal size).
C = 1 3/4" wide at the nut.
D = 1 7/8" wide at the nut. "

from: http://home.provide.net/~cfh/fender.html

I'm not sure if there are many vintage D necks out there for sale. Scarcity will mean the prices will be through the roof. Good luck.

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Obligatory gear list: Fender, Rickenbacker, Gibson, Gretsch, Vox, Martin, and more Fender.