I'm building up an Raleigh Grand Prix circa early 70's and want to keep the fork as its chrome is still intact and matches the frameset nicely.
What is holding me up is the headset; for the life of me I cannot find a 26 thread vs standard 24 thread headset anywhere online and LBS's around me refuse to acknowledge the 20th century. Besides locating another frame/fork/headset for parts, does anyone have any sources for these threaded headsets or a workaround? I know the bottom can go ISO but that upper needs the 26 thread count and I just can't find it.

Thanks!