I am getting ready to build a wheelset, and I'm looking for the necessary information to calculate proper spoke lengths. I found one database that provides spoke lengths for various rim and hub combinations, but because I don't have the hubs yet I had no way to verify if it was accurate. I'm hoping to find a site that either lists the necessary hub specs, or a database that provides verifiable spoke lengths for different hub and rim combos. Any leads would be much appreciated.

By the way, I'm using 32h Dura Ace hubs with Mavic Open Pro rims and a 3x lacing pattern. It's a pretty classic wheelset, so I imagine that the spoke lengths are posted out there somewhere.