There are frequent questions posted on appropriate brakeline fittings, inverted flare fittings, etc.
Dana/ Weatherhead has an online catalog with pictures and part #s.
While it may not answer the question of "what part # specifically fits my 84 GN's master cylinder", it is nonetheless a very useful pictorial guide of what's available.
Note that among many parts guys, "Weatherhead" has become a generic term, like using "coke" to describe any cola, "xerox" to describe photocopying, "kleenex" to describe tissues, etc.
Personally, I specifically make a point to use only "Weatherhead brand", because the quality & machining is very high. No "casting lines" or "casting flash" on Weatherheads!
Master Index to all Weather head fittings:
http://www2.dana.com/expert/wc.dll?cvsp~depdf~3~_0O00LV0DQ~
Sub-sections of special interest:
Hydraulic brake fittings (mainly inverted flare, and some metric) http://www2.dana.com/expert/pdf/HYDRAULICBRAKE.PDF
All Inverted Flare fittings
http://www2.dana.com/expert/pdf/INVERTEDFLARE.PDF
visual quick reference of all fittings, not just Inv Flare
http://www2.dana.com/expert/pdf/VISUALQUICKREFER.PDF
Dana/ Weatherhead has an online catalog with pictures and part #s.
While it may not answer the question of "what part # specifically fits my 84 GN's master cylinder", it is nonetheless a very useful pictorial guide of what's available.
Note that among many parts guys, "Weatherhead" has become a generic term, like using "coke" to describe any cola, "xerox" to describe photocopying, "kleenex" to describe tissues, etc.
Personally, I specifically make a point to use only "Weatherhead brand", because the quality & machining is very high. No "casting lines" or "casting flash" on Weatherheads!
Master Index to all Weather head fittings:
http://www2.dana.com/expert/wc.dll?cvsp~depdf~3~_0O00LV0DQ~
Sub-sections of special interest:
Hydraulic brake fittings (mainly inverted flare, and some metric) http://www2.dana.com/expert/pdf/HYDRAULICBRAKE.PDF
All Inverted Flare fittings
http://www2.dana.com/expert/pdf/INVERTEDFLARE.PDF
visual quick reference of all fittings, not just Inv Flare
http://www2.dana.com/expert/pdf/VISUALQUICKREFER.PDF