50Olds88

Hello. I'm working on a '50 Olds 88 Club Coupe, installing a 455 ci Olds motor. I would like to upgrade the front suspension while everything is exposed from kingpin to ball joint. Also want to upgrade the front brakes to disk. There is an article on the internet on doing this upgrade, but depends on using a '58 Pontiac lower control arm which is supposed to be the same dimensions as the Olds control arm. So far have not been able to locate these and wondered if anyone knew of a source, or possibly another replacement with the same dimensions as the Olds/Pontiac lower control arm.

Thanks for your help.