Joined: Jan 2008
Posts: 23,639
Likes: 1,106
From: Mans of NC & SW UT Desert
Bikes: 86 Katakura Silk, 87 Prologue X2, 88 Cimarron LE, 1975 Sekai 4000 Professional, 73 Paramount, plus more
I would not change those brake calipers since they match the bike. They appear to be original. Those Dura Ace calipers don't look like they have enough reach. I would measure what you have and contact the seller.
Very nice find!!!