Wasn't it just a longer nut? The bolt end was always on the brake caliper.
I made sure to always save the one that came with my Serotta back when I had it. (I had an F3 fork)
But I thought these weren't that hard to get from a LBS through the distributors. I highly doubt Serotta had to get those made special for them, there were probably other forks which used the longer nuts. Maybe it was a Shimano part.
If it turns out to be that hard I'd go asking someone like Dave Kirk.
Here are a couple potential Shimano PNs:
18mm Recessed brake caliper nut: Y85574310
32mm Recessed brake caliper nut: Y8A023210
Both of them came up on Universal Cycles when I searched in google.
Last edited by benb; 08-15-2019 at 10:56 AM.
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