Marcus beat me to it. Independent Wheel specializes in doing this especially for the brands that are no longer around like Kinesis
http://www.independentwheel.com/
Might as well mention these guys too in case anyone else needs to find parts for multi-piece rims
https://store.blackforestindustries.com/ I found them when looking for BBS information and parts.
We should make a sticky at the top of the forum for this info.....