Altman door latch/lock?

[J48chevy]

Ok this may have been asked before but could not find what I am looking for in my search. Anyhow, I installed the Altman latches and want to install the outside keyed lock in the passenger side door. Problem I am running into is I bought a new retro door lock and keys. The shaft I know needs to be trimmed down but the shaft on the new lock is smaller than the hole in the Altman latch. When in it just spins and barely catches. Has anyone who installed these latches had trouble putting the key lock in? Anyone have pics or thoughts? Much appreciated.