Google 1939 olds rear suspension
I have olds rear ends in 2 rod projects
Info about swaps on a later axle and keeping most olds pieces and this info
looks like I bought them from Steele Rubber.
25-0080-32 rear axle track bar bushing and
25-0082-32 rear axle support arm bushing on this receipt
also someone said they used the mid 60's truck bushings.